TOP 10 Leadership training for students in New City, New York
Search for local businesses, places and services near you
- United States
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
- Ukraine
- United Kingdom
- Italy
- Poland
- Australia
- Spain
- New Zealand
- France
- Germany
- Ireland
Yeshiva of Kings Bay
The Yeshiva of Kings Bay is a reputable school located at 2611 Avenue Z in New York, United States. This institution is dedicated to providing a quality education in a nurturing environment for students of all backgrounds. With a strong emphasis on Jewish values and traditions, the Yeshiva of Kings Bay offers a well-rounded curriculum that includes both secular and religious studies. Students are encouraged to excel academically, spiritually, and socially, preparing them for future success in all aspects of life. The dedicated faculty and staff at the Yeshiva of Kings Bay are committed to helping each student reach their full potential and become responsible members of society.
Atidaynu - Our Future School
Atidaynu - Our Future School is a premier educational institution located at 7914 Bay Parkway in New York, United States. As a primary and secondary school, we are dedicated to providing a nurturing and stimulating learning environment for students of all ages. Our experienced faculty and staff are committed to fostering academic excellence, personal growth, and a strong sense of community among our students. At Atidaynu - Our Future School, we believe in preparing our students for a successful future by instilling a love for learning and a passion for knowledge. Join us in shaping the leaders of tomorrow at Atidaynu - Our Future School.
Ha'Or Beacon School
Ha'Or Beacon School is a prestigious educational institution located at 2884 Nostrand Avenue in New York, United States. As a beacon of knowledge and excellence, our school is dedicated to providing a nurturing and stimulating learning environment for students of all ages. With a focus on academic rigor, character development, and community engagement, Ha'Or Beacon School prepares students for success in their future endeavors. Our dedicated faculty and staff are committed to fostering a love of learning and helping students reach their full potential. Join us at Ha'Or Beacon School and embark on a journey towards academic and personal growth.
Bay Ridge Prep Upper School
Bay Ridge Prep Upper School is an independent K-12 institution located in Brooklyn, New York. Our school serves students from across the New York City area, fostering intellectual curiosity, creativity, and emotional intelligence in an inclusive and student-centered community. Our dedicated faculty, with 95% holding advanced degrees, come from diverse backgrounds and are committed to creating a positive learning experience for each student. Our curriculum emphasizes innovation and practical application, offering a wide range of advanced courses in math, science, and social sciences. Students have the opportunity to participate in Constellation Learning, a group of globally connected independent schools offering blended and online courses.
Magen David Yeshivah
Magen David Yeshivah is a prestigious school located at 2130 McDonald Avenue in New York, United States. It is known for its commitment to academic excellence and Jewish values. The institution offers a comprehensive education that includes both secular and religious studies, preparing students for success in all aspects of their lives. With a strong sense of community and a dedicated faculty, Magen David Yeshivah creates a nurturing environment where students can thrive and grow.
Midwood Catholic Academy
Midwood Catholic Academy is a prestigious school located at 1501 Hendrickson Street in New York, United States. As an institution dedicated to providing quality education, we strive to nurture the intellectual, spiritual, and emotional growth of our students. With a strong emphasis on Catholic values and academic excellence, our experienced faculty and staff are committed to helping students reach their full potential. Join us at Midwood Catholic Academy and be a part of a vibrant learning community that fosters a love for learning and a sense of community.
Bay Ridge Prep Lower & Middle Schools
Bay Ridge Prep Lower & Middle Schools is a prestigious educational institution located at 8101 Ridge Boulevard in New York, United States. Our school provides a nurturing and enriching learning environment for students from kindergarten through eighth grade. With a focus on academic excellence, character development, and social growth, Bay Ridge Prep Lower & Middle Schools are dedicated to preparing students for success in high school and beyond. Our dedicated faculty and staff work tirelessly to create a supportive and inclusive community where every student can thrive. Join us at Bay Ridge Prep Lower & Middle Schools and watch your child reach their full potential.
Elementary school
The Elementary School located at 1400 Linden Boulevard in New York, United States, is a vibrant and welcoming institution dedicated to providing quality education to young students. Our school offers a diverse and inclusive learning environment where students are encouraged to explore, discover, and grow. With a dedicated team of teachers and staff, we strive to create a nurturing and supportive atmosphere that fosters academic success and personal development. At our Elementary School, we believe in the potential of every child and are committed to helping them achieve their full potential. Join us in shaping the future leaders of tomorrow!
Maurice W Downing School
Maurice W Downing School is a vibrant primary school located at 55 Acorn Way in Malverne, New York, United States. Our school is dedicated to providing a nurturing and stimulating learning environment for students from kindergarten through fifth grade. With a focus on academic excellence, character development, and community involvement, Maurice W Downing School strives to empower students to reach their full potential. Our dedicated faculty and staff work tirelessly to create a safe and inclusive atmosphere where students can thrive both academically and socially. Join us at Maurice W Downing School and watch your child grow and succeed!
P.S. 161 Arthur Ashe School
P.S. 161 Arthur Ashe School is a prestigious primary school located in New York, United States. Our institution is dedicated to providing a high-quality education to our students, with a focus on academic excellence and character development. We offer a nurturing and supportive learning environment where students can thrive and reach their full potential. Our experienced and dedicated faculty members are committed to helping each student succeed academically and personally. At P.S. 161 Arthur Ashe School, we strive to inspire a love for learning and instill values of respect, responsibility, and resilience in our students. Join us in shaping the future leaders of tomorrow!
Ps 305 Learners and Leaders
PS 305 Learners and Leaders is a school located at 378 Seneca Avenue in New York, United States. Our institution is dedicated to fostering a community of lifelong learners and future leaders. We provide a comprehensive education that empowers our students to excel academically, socially, and emotionally. Our experienced faculty and staff are committed to creating a supportive and inclusive environment where every student can thrive. At PS 305 Learners and Leaders, we believe in nurturing the potential of each individual and preparing them for success in an ever-changing world. Join us in shaping the leaders of tomorrow.
P.S. 223 Lyndon B. Johnson
P.S. 223 Lyndon B. Johnson is a primary school located at 125-20 Sutphin Boulevard in New York, United States. This institution is dedicated to providing a quality education to students in the local community. With a focus on academic excellence and personal growth, P.S. 223 offers a supportive and nurturing environment for students to thrive. The school is named after former President Lyndon B. Johnson, reflecting its commitment to leadership and civic engagement. P.S. 223 is known for its dedicated teachers, engaging curriculum, and strong sense of community. It is a place where students can learn, grow, and achieve their full potential.
The Highbridge Green School
The Highbridge Green School is a reputable educational institution located at 200 West 167th Street in New York, United States. This school provides a nurturing and stimulating environment for students to thrive academically and personally. With a focus on academic excellence and holistic development, The Highbridge Green School offers a diverse range of programs and extracurricular activities to cater to the individual needs of each student. For more information, you can contact the school at vdiaz6@schools.nyc.gov or call (718) 410-5770.
PS 513 Castle Bridge School
PS 513 Castle Bridge School is a prestigious educational institution located at 560 West 169th Street in New York, New York. As a public school, we are dedicated to providing high-quality education to our students, preparing them for success in their academic and personal lives. Our school offers a nurturing and supportive environment where students can thrive and reach their full potential. With a focus on academic excellence, character development, and community involvement, PS 513 Castle Bridge School is committed to shaping the future leaders of tomorrow. Join us in our mission to inspire, educate, and empower our students to achieve their goals and make a positive impact on the world.
South Bronx Classical Charter School III
South Bronx Classical Charter School III is a primary school located at 3458 Third Avenue in New York, United States. We are dedicated to providing an excellent education for our scholars and offer a range of extracurricular activities, intramural teams, and seasonal clubs for students to participate in. One of our valued staff members, Ms. Newman, has been with Classical Charter Schools since 2017 and has taken on various roles within the institution. She started as a Classicorps Fellow and has since taught Kindergarten and 3rd Grade, served as a Grade Team Leader, and currently works as an Instructional Coach. Ms. Newman's commitment to student education was recognized when she was selected for the School Leader Fellowship in 2022. She holds a BA in Elementary Education and Human Development from Boston College and has pursued a Master's degree from Relay Graduate School to further enhance her teaching approach.
8171 Cole Road
8171 Cole Road is a reputable institution located in Colden, New York. Offering a range of services and programs, this institution is dedicated to providing high-quality education and support to its students. Situated in a peaceful and picturesque setting, 8171 Cole Road provides a conducive learning environment for individuals of all ages. With a team of experienced and dedicated staff members, this institution strives to help students reach their full potential and achieve their academic and personal goals. Whether you are looking to further your education or gain new skills, 8171 Cole Road is the place to be.
Mexicana High Class
Mexicana High Class is a prestigious institution located at 4907 103rd Street in New York, United States. We offer high-quality education and training in various fields such as business, technology, and healthcare. Our experienced faculty members and state-of-the-art facilities provide students with the tools they need to succeed in their chosen careers. With a focus on academic excellence and professional development, Mexicana High Class is committed to preparing students for the challenges of the modern workforce. Join us and take your education to the next level.
Dr. Walter Cooper Academy School No.10
Dr. Walter Cooper Academy School No.10 is a primary school located at 353 Congress Avenue in Rochester, New York, United States. This institution is dedicated to providing a high-quality education to students in a nurturing and supportive environment. With a focus on academic excellence and character development, Dr. Walter Cooper Academy School No.10 strives to prepare students for success in school and beyond. The school offers a variety of programs and resources to support student learning and growth, and is committed to fostering a love of learning in all students. With a team of dedicated educators and staff, Dr. Walter Cooper Academy School No.10 is a place where students can thrive and reach their full potential.
Fitzhugh Park School
Fitzhugh Park School is a vibrant primary school located at 195 East Bridge Street in Oswego, New York, United States. Our dedicated staff is committed to providing a high-quality education for students in grades kindergarten through sixth. With a focus on academic excellence and character development, Fitzhugh Park School offers a supportive and nurturing environment where students can thrive. Our school is equipped with modern facilities and resources to enhance the learning experience, and we strive to create a positive and inclusive community for all students. Join us at Fitzhugh Park School and discover the endless possibilities for your child's education.
Guardino Elementary School
Guardino Elementary School is a vibrant and welcoming primary school located at 600 High Street in Clayton, New York, United States. Our dedicated staff is committed to providing a nurturing and supportive learning environment for students to thrive academically and personally. With a focus on academic excellence, character development, and community involvement, Guardino Elementary School prepares students for success in their future endeavors. Come join our school community and experience the difference at Guardino Elementary School.
Mexico Middle School
Mexico Middle School is a reputable educational institution located at 16 Fravor Road in Mexico, New York, United States. As a school, it provides a nurturing and enriching environment for students in grades 6-8. The dedicated faculty and staff at Mexico Middle School are committed to fostering academic excellence, personal growth, and social development in every student. With a focus on a well-rounded education, the school offers a variety of extracurricular activities and programs to support the diverse interests and talents of its student body. Mexico Middle School is known for its strong sense of community, where students are encouraged to explore their potential and achieve their goals.
Evans Mills Primary School
Evans Mills Primary School is a vibrant and welcoming educational institution located at 8438 Leray Street in Evans Mills, New York, United States. As a primary school, we are dedicated to providing a nurturing and supportive environment for our students to learn and grow. Our experienced and dedicated staff are committed to helping each child reach their full potential academically, socially, and emotionally. With a focus on individualized learning, we strive to create a positive and inclusive atmosphere where every student feels valued and supported. At Evans Mills Primary School, we believe in fostering a love of learning and preparing our students for success in their future endeavors.
Evans Mills Elementary School
Evans Mills Elementary School is a vibrant primary school located at 8442 South Main Street in Evans Mills, New York, United States. Our school is dedicated to providing a nurturing and stimulating learning environment for students in their formative years. With a focus on academic excellence, character development, and social growth, we strive to prepare our students for success in their future endeavors. Our dedicated staff is committed to fostering a love of learning and encouraging each student to reach their full potential. Join us at Evans Mills Elementary School, where every child is valued and supported on their educational journey.
Philadelphia Primary School
Philadelphia Primary School is a vibrant and welcoming educational institution located at 3 Sand Street in Philadelphia, New York. As a primary school, we are dedicated to providing a nurturing and stimulating environment for young learners to thrive academically, socially, and emotionally. Our experienced and passionate educators are committed to helping students develop a strong foundation of knowledge and skills that will set them up for success in their academic journey. At Philadelphia Primary School, we prioritize the holistic development of each child and strive to create a supportive community where students feel valued and empowered to reach their full potential. Join us at Philadelphia Primary School and embark on an enriching educational experience that will shape the future leaders of tomorrow.
John F. Kennedy School
The John F. Kennedy School is a primary school located at 801-809 Park Street in Ogdensburg, New York, United States. This institution is dedicated to providing a high-quality education to students in the local community. With a focus on academic excellence and personal growth, the John F. Kennedy School offers a supportive and nurturing learning environment for students to thrive. The school is committed to helping students reach their full potential and prepare them for future success. With a dedicated staff and comprehensive curriculum, the John F. Kennedy School is a place where students can learn, grow, and succeed.
St Marguerite D'Louville Academy
St. Marguerite D'Louville Academy is a prestigious school located at 315 Gates Street in Ogdensburg, New York, United States. Our institution is dedicated to providing a high-quality education for students of all ages. With a focus on academic excellence, character development, and community engagement, we strive to prepare our students for success in their future endeavors. Our experienced faculty and staff are committed to creating a supportive and nurturing learning environment where students can thrive and reach their full potential. Join us at St. Marguerite D'Louville Academy and embark on a journey of growth, learning, and achievement.
Nightengale Elementary School
Nightengale Elementary School is a vibrant and welcoming primary school located at 84 Nightengale Avenue in Massena, New York. Our school is dedicated to providing a nurturing and supportive learning environment for students from kindergarten through fifth grade. With a focus on academic excellence, character development, and individualized attention, Nightengale Elementary School strives to help every student reach their full potential. Our dedicated faculty and staff are committed to creating a positive and inclusive atmosphere where students can thrive both academically and socially. Join us at Nightengale Elementary School, where every child's future shines bright.
Adirondack Elementary School
Adirondack Elementary School is a welcoming primary school located at 110 Ford Street in Boonville, New York, United States. Our school is dedicated to providing a safe and supportive learning environment for students in kindergarten through fifth grade. With a focus on academic excellence and character development, we strive to empower our students to reach their full potential. Our experienced and caring staff work tirelessly to create engaging and enriching educational experiences for all students. At Adirondack Elementary School, we are committed to fostering a love of learning and helping students build the foundation for future success.
Cato-Meridian Elementary School
Cato-Meridian Elementary School is a primary school located in Cato, New York, United States. Our school is dedicated to providing a nurturing and engaging learning environment for students in kindergarten through fifth grade. With a focus on academic excellence and character development, our dedicated faculty and staff work tirelessly to ensure that each child reaches their full potential. At Cato-Meridian Elementary School, we strive to create a supportive community where students can thrive and grow into confident, lifelong learners. Come visit us at 2851 New York 370 and see the difference a quality education can make in your child's life.
Fairgrieve Elementary School
Fairgrieve Elementary School is a vibrant primary school located at 716 Academy Street in Fulton, New York, United States. Our dedicated staff is committed to providing a nurturing and engaging learning environment for students in their formative years. We offer a comprehensive curriculum that focuses on academic excellence, social-emotional development, and physical well-being. With a focus on personalized learning and innovative teaching methods, Fairgrieve Elementary School ensures that each student reaches their full potential. Join us in shaping the future leaders of tomorrow at Fairgrieve Elementary School.
People also searched for:
- leadership training for students in Albany
- leadership training for students in Albion
- leadership training for students in Alexandria Bay
- leadership training for students in Amherst
- leadership training for students in Amityville
- leadership training for students in Amsterdam
- leadership training for students in Angola
- leadership training for students in Ardsley
- leadership training for students in Armonk
- leadership training for students in Babylon
- leadership training for students in Baldwin
- leadership training for students in Baldwinsville
- leadership training for students in Batavia
- leadership training for students in Bay Shore
- leadership training for students in Beacon
- leadership training for students in Bedford Hills
- leadership training for students in Bellport
- leadership training for students in Binghamton
- leadership training for students in Boonville
- leadership training for students in Brentwood
- leadership training for students in Brewerton
- leadership training for students in Brewster
- leadership training for students in Brockport
- leadership training for students in Bronx
- leadership training for students in Bronxville
- leadership training for students in Brooklyn
- leadership training for students in Buffalo
- leadership training for students in Camillus
- leadership training for students in Canton
- leadership training for students in Cazenovia
- leadership training for students in Cedarhurst
- leadership training for students in Center Moriches
- leadership training for students in Centereach
- leadership training for students in Central Islip
- leadership training for students in Central Square
- leadership training for students in Cheektowaga
- leadership training for students in Chester
- leadership training for students in Chittenango
- leadership training for students in Cicero
- leadership training for students in Clarence
- leadership training for students in Clayton
- leadership training for students in Clifton Park
- leadership training for students in Clinton
- leadership training for students in Cohoes
- leadership training for students in Cold Spring
- leadership training for students in Commack
- leadership training for students in Cooperstown
- leadership training for students in Copiague
- leadership training for students in Cortland
- leadership training for students in Cortlandt
- leadership training for students in Cutchogue
- leadership training for students in Deer Park
- leadership training for students in Delhi
- leadership training for students in Delmar
- leadership training for students in Depew
- leadership training for students in Dix Hills
- leadership training for students in Dobbs Ferry
- leadership training for students in East Amherst
- leadership training for students in East Aurora
- leadership training for students in East Meadow
- leadership training for students in East Northport
- leadership training for students in East Syracuse
- leadership training for students in Eastchester
- leadership training for students in Elmont
- leadership training for students in Elmsford
- leadership training for students in Endicott
- leadership training for students in Endwell
- leadership training for students in Fairport
- leadership training for students in Farmingdale
- leadership training for students in Fayetteville
- leadership training for students in Floral Park
- leadership training for students in Franklin Square
- leadership training for students in Fredonia
- leadership training for students in Freeport
- leadership training for students in Fulton
- leadership training for students in Garden City
- leadership training for students in Geneseo
- leadership training for students in Getzville
- leadership training for students in Glen Cove
- leadership training for students in Goshen
- leadership training for students in Gowanda
- leadership training for students in Grand Island
- leadership training for students in Great Neck
- leadership training for students in Greenlawn
- leadership training for students in Hamburg
- leadership training for students in Hampton Bays
- leadership training for students in Harrison
- leadership training for students in Hartsdale
- leadership training for students in Hastings-on-Hudson
- leadership training for students in Hauppauge
- leadership training for students in Haverstraw
- leadership training for students in Hempstead
- leadership training for students in Herkimer
- leadership training for students in Hewlett
- leadership training for students in Hicksville
- leadership training for students in Highland
- leadership training for students in Hilton
- leadership training for students in Holbrook
- leadership training for students in Hornell
- leadership training for students in Huntington
- leadership training for students in Huntington Station
- leadership training for students in Hyde Park
- leadership training for students in Inwood
- leadership training for students in Irving
- leadership training for students in Irvington
- leadership training for students in Islip
- leadership training for students in Jamestown
- leadership training for students in Jericho
- leadership training for students in Johnson City
- leadership training for students in Kenmore
- leadership training for students in Kings Park
- leadership training for students in Kingston
- leadership training for students in Lake Grove
- leadership training for students in Lancaster
- leadership training for students in Larchmont
- leadership training for students in Latham
- leadership training for students in Lawrence
- leadership training for students in Levittown
- leadership training for students in Liberty
- leadership training for students in Lindenhurst
- leadership training for students in Little Falls
- leadership training for students in Liverpool
- leadership training for students in Lockport
- leadership training for students in Lowville
- leadership training for students in Lynbrook
- leadership training for students in Mahopac
- leadership training for students in Mamaroneck
- leadership training for students in Manhasset
- leadership training for students in Manlius
- leadership training for students in Manorville
- leadership training for students in Marcellus
- leadership training for students in Massapequa
- leadership training for students in Massapequa Park
- leadership training for students in Massena
- leadership training for students in Mattituck
- leadership training for students in Mayville
- leadership training for students in Medford
- leadership training for students in Medina
- leadership training for students in Melville
- leadership training for students in Merrick
- leadership training for students in Mexico
- leadership training for students in Middletown
- leadership training for students in Mineola
- leadership training for students in Monroe
- leadership training for students in Monsey
- leadership training for students in Montgomery
- leadership training for students in Monticello
- leadership training for students in Mount Vernon
- leadership training for students in New Hartford
- leadership training for students in New Hyde Park
- leadership training for students in New Paltz
- leadership training for students in New Rochelle
- leadership training for students in New Windsor
- leadership training for students in New York City
- leadership training for students in Newburgh
- leadership training for students in Niagara Falls
- leadership training for students in North Tonawanda
- leadership training for students in Northport
- leadership training for students in Nyack
- leadership training for students in Oakdale
- leadership training for students in Oceanside
- leadership training for students in Ogdensburg
- leadership training for students in Old Forge
- leadership training for students in Olean
- leadership training for students in Oneida
- leadership training for students in Oneonta
- leadership training for students in Orangeburg
- leadership training for students in Orchard Park
- leadership training for students in Ossining
- leadership training for students in Oswego
- leadership training for students in Owego
- leadership training for students in Oyster Bay
- leadership training for students in Patchogue
- leadership training for students in Pearl River
- leadership training for students in Peekskill
- leadership training for students in Phoenix
- leadership training for students in Pine Bush
- leadership training for students in Pittsford
- leadership training for students in Plainview
- leadership training for students in Plattsburgh
- leadership training for students in Pleasantville
- leadership training for students in Port Chester
- leadership training for students in Port Jefferson Station
- leadership training for students in Port Jervis
- leadership training for students in Port Washington
- leadership training for students in Potsdam
- leadership training for students in Poughkeepsie
- leadership training for students in Pulaski
- leadership training for students in Queens
- leadership training for students in Rhinebeck
- leadership training for students in Riverhead
- leadership training for students in Rochester
- leadership training for students in Rockville Centre
- leadership training for students in Rome
- leadership training for students in Ronkonkoma
- leadership training for students in Roslyn
- leadership training for students in Roslyn Heights
- leadership training for students in Rye
- leadership training for students in Rye Brook
- leadership training for students in Saint James
- leadership training for students in Salina
- leadership training for students in Sanborn
- leadership training for students in Saratoga Springs
- leadership training for students in Sayville
- leadership training for students in Scarsdale
- leadership training for students in Schenectady
- leadership training for students in Seaford
- leadership training for students in Selden
- leadership training for students in Setauket- East Setauket
- leadership training for students in Shirley
- leadership training for students in Sleepy Hollow
- leadership training for students in Smithtown
- leadership training for students in Southold
- leadership training for students in Spencerport
- leadership training for students in Spring Valley
- leadership training for students in Staten Island
- leadership training for students in Stony Brook
- leadership training for students in Stony Point
- leadership training for students in Suffern
- leadership training for students in Syosset
- leadership training for students in Syracuse
- leadership training for students in Tarrytown
- leadership training for students in Tonawanda
- leadership training for students in Troy
- leadership training for students in Uniondale
- leadership training for students in Utica
- leadership training for students in Valhalla
- leadership training for students in Valley Cottage
- leadership training for students in Valley Stream
- leadership training for students in Vestal
- leadership training for students in Victor
- leadership training for students in Wantagh
- leadership training for students in Wappingers Falls
- leadership training for students in Warwick
- leadership training for students in Watertown
- leadership training for students in Webster
- leadership training for students in West Babylon
- leadership training for students in West Hempstead
- leadership training for students in West Islip
- leadership training for students in West Nyack
- leadership training for students in West Seneca
- leadership training for students in Westbury
- leadership training for students in Westhampton Beach
- leadership training for students in White Plains
- leadership training for students in Williamsville
- leadership training for students in Williston Park
- leadership training for students in Woodbury
- leadership training for students in Wyandanch
- leadership training for students in Yonkers
People also searched for:
List of local businesses, places and services in New York
⭐ business help 🔍 services ☎ phones 🕒 opening times ✍️reviews 🌍 addresses, locations 📷 photos