- 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
TOP 30 Professional advisory services in New York, NY
2142 results found
Search for local businesses, places and services near you
Capstone Financial Services
Capstone Financial Services is a leading finance institution located at 11 Taylor Road in Mount Kisco, New York, United States. Our team of experienced professionals provide a wide range of financial services including investment advice, retirement planning, wealth management, and more. We are dedicated to helping our clients achieve their financial goals and secure their future. Contact us today to learn more about how Capstone Financial Services can help you navigate the complexities of the financial world.
Jared D Lynne - Private Wealth Advisor, Ameriprise Financial Services, LLC
Jared D Lynne - Private Wealth Advisor at Ameriprise Financial Services, LLC, located at 427 Bedford Road, Pleasantville, New York, United States, offers a wide range of financial services and expertise. Jared D Lynne holds various certifications including AAMS™, ADPA™, AEP®, AIF®, APMA™, AWMA℠, Behavioral Financial Advisor, CAP®, CAS®, CASL®, Certified Divorce Financial Analyst, Certified Estate Planner™, Certified Exit Planning Advisor®, CFA®, CFP®, Certified Fund Specialist, ChFC®, Chartered Special Needs Consultant, CIMA®, Certified Kingdom Advisor®, Certified in Long-Term Care, Chartered Life Underwriter Designation®, and Certified Military Financial Advisor®. These certifications demonstrate Jared D Lynne's commitment to providing comprehensive and specialized financial planning services to individuals, retirees, small business owners, high net worth clients, and seniors. Whether you need assistance with asset management, estate planning, retirement planning, investment strategies, or insurance products, Jared D Lynne has the knowledge and expertise to help you achieve your financial goals. Contact Jared D Lynne - Private Wealth Advisor at Ameriprise Financial Services, LLC for personalized and professional financial advice.
Income & Asset Advisory Inc
Income & Asset Advisory Inc is a leading finance institution located at 80 Business Park Drive in Armonk, New York. Our team of experienced financial advisors are dedicated to helping our clients manage their income and assets effectively. Whether you are looking to grow your investments, plan for retirement, or protect your wealth, we provide personalized solutions to meet your financial goals. Contact us today to schedule a consultation and take the first step towards securing your financial future.
Raymond James Financial Services
Raymond James Financial Services is a reputable finance institution located at 20 Maple Avenue in Armonk, New York, United States. With a strong presence in the financial industry, Raymond James offers a wide range of services including wealth management, investment banking, and financial planning. Their team of experienced professionals is dedicated to providing personalized financial solutions to help clients achieve their financial goals. Whether you are looking to grow your wealth, plan for retirement, or navigate the complexities of the financial markets, Raymond James Financial Services is committed to helping you secure a strong financial future.
Charles Camilleri - Private Wealth Advisor, Ameriprise Financial Services, LLC
Charles Camilleri is a Private Wealth Advisor at Ameriprise Financial Services, LLC located at 200 Summit Lake Drive, Valhalla, New York, United States. Charles holds various certifications including AAMS™, ADPA™, AEP®, AIF®, APMA™, AWMA℠, Behavioral Financial Advisor, CAP®, CAS®, CASL®, Certified Divorce Financial Analyst, Certified Estate Planner™, Certified Exit Planning Advisor®, Chartered Financial Analyst®, CERTIFIED FINANCIAL PLANNER™, Certified Fund Specialist, Chartered Financial Consultant®, Chartered Special Needs Consultant, Certified Investment Management Analyst®, Certified Kingdom Advisor®, Certified in Long-Term Care, and Chartered Life Underwriter Designation®. These certifications demonstrate Charles' expertise in asset management, retirement planning, estate planning, investment strategies, risk management, and financial planning for various client needs including retirees, small business owners, high net worth individuals, and those with special needs. Charles is committed to providing comprehensive financial advice and helping clients achieve their financial goals in a professional and ethical manner.
Paradigm Wealth - Ameriprise Financial Services, LLC
Paradigm Wealth - Ameriprise Financial Services, LLC is a finance institution located at 427 Bedford Road, Pleasantville, New York, United States. They offer financial planning services and investment advice to help clients achieve their financial goals. Their team of Ameriprise financial advisors are registered in certain U.S. states and adhere to strict regulations to ensure client satisfaction and security. The institution provides an initial consultation to discuss individual financial needs and offers insights on stock market trends and investment opportunities. Clients can trust in the expertise and professionalism of Ameriprise Financial Services, LLC to guide them towards a secure financial future.
Eric Traditi - Financial Advisor, Ameriprise Financial Services, LLC
Eric Traditi is a Financial Advisor at Ameriprise Financial Services, LLC located at 100 Summit Lake Drive in Valhalla, New York, United States. Eric holds various certifications including AAMS™, ADPA™, AEP®, AIF®, APMA™, AWMA℠, Behavioral Financial Advisor, CAP®, CAS®, CASL®, Certified Divorce Financial Analyst, Certified Estate Planner™, Certified Exit Planning Advisor®, Chartered Financial Analyst®, CERTIFIED FINANCIAL PLANNER™, Certified Fund Specialist, Chartered Financial Consultant®, Chartered Special Needs Consultant, Certified Investment Management Analyst®, Certified Kingdom Advisor®, Certified in Long-Term Care, and Chartered Life Underwriter Designation®. These certifications demonstrate Eric's expertise in various areas of finance, including asset management, retirement planning, estate planning, investment management, and more. Whether you are a retiree, small business owner, or high net worth individual, Eric Traditi has the knowledge and skills to help you achieve your financial goals.
Anthony Leopizzi - Private Wealth Advisor, Ameriprise Financial Services, LLC
Anthony Leopizzi - Private Wealth Advisor at Ameriprise Financial Services, LLC, located at 399 Knollwood Road in White Plains, New York, offers a wide range of financial services and expertise. With certifications such as AAMS™, ADPA™, AEP®, AIF®, APMA™, AWMA℠, and many more, Anthony Leopizzi provides comprehensive wealth management solutions tailored to individual needs. Specializing in areas such as asset management, retirement planning, estate planning, and investment strategies, Anthony Leopizzi is committed to upholding the highest standards of professionalism and ethics. Whether you are a retiree, small business owner, or high net worth client, Anthony Leopizzi has the knowledge and experience to help you achieve your financial goals.
Ronald Rienas - Financial Advisor, Ameriprise Financial Services, LLC
Ronald Rienas - Financial Advisor at Ameriprise Financial Services, LLC, located at 399 Knollwood Road, White Plains, New York, offers comprehensive financial planning services to help clients achieve their financial goals. With a background and qualification information available on FINRA's BrokerCheck website, clients can trust in the expertise and professionalism of Ronald Rienas. The institution provides a Client Relationship Summary Disclosure to ensure transparency and clarity in all financial transactions. Whether you are looking to understand the current market trends or planning for a more secure financial future, Ronald Rienas is here to guide you through the process.
Downtown Investment Advisory
Downtown Investment Advisory is a finance institution located at 360 Hamilton Avenue in White Plains, New York. Our team of experienced financial advisors provides personalized investment services to help individuals and businesses achieve their financial goals. Whether you are looking to grow your wealth, plan for retirement, or manage your assets, we are dedicated to providing expert guidance and support every step of the way. Contact us today to schedule a consultation and start building a secure financial future.
Austro Financial Services NY Port chester
Austro Financial Services NY Port Chester is a finance institution located at 110 Willett Avenue in Port Chester, New York. Our team of experienced professionals is dedicated to providing personalized financial services to help our clients achieve their financial goals. Whether you are looking to invest, plan for retirement, or manage your finances, we are here to help. Contact us today to schedule a consultation and learn how we can assist you with your financial needs.
Burchell Wealth Management - UBS Financial Services Inc.
Burchell Wealth Management - UBS Financial Services Inc. is a prestigious finance institution located at 709 Westchester Avenue in White Plains, New York, United States. With a strong reputation for excellence in financial services, Burchell Wealth Management offers a wide range of investment and wealth management solutions tailored to meet the unique needs of their clients. Their team of experienced professionals provides personalized guidance and expertise to help clients achieve their financial goals. Whether you are looking to grow your wealth, plan for retirement, or protect your assets, Burchell Wealth Management - UBS Financial Services Inc. is dedicated to helping you secure a prosperous financial future.
McMahon Sable Wealth Management Group - UBS Financial Services Inc.
McMahon Sable Wealth Management Group - UBS Financial Services Inc. is a renowned finance institution located at 709 Westchester Avenue in White Plains, New York, United States. With a strong reputation for providing top-notch financial services, the institution offers expert wealth management solutions to help clients secure their financial future. Whether you are looking to invest, plan for retirement, or manage your assets, McMahon Sable Wealth Management Group has a team of experienced professionals ready to assist you. Trust in their expertise and dedication to help you achieve your financial goals.
Michael Carter - Financial Advisor, Ameriprise Financial Services, LLC
Michael Carter - Financial Advisor, Ameriprise Financial Services, LLC is a reputable finance institution located at 800 Westchester Avenue in Rye Brook, New York, United States. As a trusted financial advisor, Michael Carter provides personalized financial planning and investment services to help clients achieve their financial goals. With a focus on building long-term relationships and providing expert guidance, clients can feel confident in their financial decisions when working with Michael Carter and Ameriprise Financial Services, LLC.
Strategic Financial & Tax Planning Services
Strategic Financial & Tax Planning Services is a comprehensive financial institution located at 150 Motor Parkway in Hauppauge, New York. Our team of expert accountants, financial advisors, and insurance agents are dedicated to providing personalized and strategic financial planning services to help individuals and businesses achieve their financial goals. Whether you need assistance with tax planning, investment strategies, or insurance coverage, our professionals are here to help you navigate the complexities of the financial world. Contact us today to schedule a consultation and take the first step towards a secure financial future.
The Tax Professionals
The Tax Professionals is a leading accounting and finance institution located at 5375 New York 7 in Oneonta, New York, United States. Our team of expert professionals is dedicated to providing top-notch tax services, financial advice, and accounting solutions to individuals and businesses alike. With years of experience and a commitment to excellence, we are here to help you navigate the complex world of taxes and finances with ease and confidence. Trust The Tax Professionals to help you achieve your financial goals and secure your financial future.
Global Financial Services
Global Financial Services is a leading accounting and finance institution located at 495 South Main Street in New City, New York, United States. With a team of experienced professionals, we provide a wide range of financial services to individuals and businesses worldwide. Our services include tax preparation, financial planning, investment management, and more. Whether you need help with your personal finances or your business needs assistance with financial strategies, our dedicated team is here to help you achieve your financial goals. Contact us today to learn more about how Global Financial Services can help you secure a stable financial future.
Fast Professional - Tax Consultant In Brooklyn NY.
Fast Professional is a leading tax consulting firm located in Brooklyn, NY. Our team of experienced professionals is dedicated to providing fast and efficient tax services to individuals and businesses in the area. With a focus on accuracy and attention to detail, we strive to help our clients maximize their returns and minimize their tax liabilities. Whether you need assistance with tax preparation, planning, or representation, our team is here to help. Visit us at 837 Avenue Z in New York to learn more about how we can assist you with all of your accounting and finance needs.
Every Penny Bookkeeping & Business Services LLC
Every Penny Bookkeeping & Business Services LLC, located at 654 Saratoga Road in Wilton, New York, is a trusted institution specializing in accounting and finance. With a focus on helping small businesses thrive, we understand the importance of every penny. Our services are designed to provide up-to-date financials, strategic planning, and accountability to help you reach your goals. As your partner, not just your provider, we offer judgment-free assistance to keep your business on track and help you maximize your skills, time, and resources. Our team is dedicated to helping you grow by strategically planning for opportunities ahead of time. We pride ourselves on being completely non-judgmental and aim to make the process as easy as possible for you.
Financial Advisory Network
Financial Advisory Network is a finance institution located at 6 Old Lane in Scarsdale, New York, United States. Known as "The Firm Engineers Rely On For Their Retirement Planning Needs", our Certified Financial Planner specializes in helping clients smoothly transition from work to retirement. With over 30 years of experience, Robert Leitner, CFP®, RIA, provides expert advice to guide clients towards their financial goals. Services include optimizing Social Security benefits, developing income plans for life, managing retirement distributions, and anticipating healthcare costs. Please consult with a qualified financial adviser and/or tax professional before implementing any strategy, as investments involve risk and are not guaranteed. Visit our website for more information and to learn more about our services.
Exclusive Financial Services Ltd.
Exclusive Financial Services Ltd. is a premier accounting and finance institution located at 97 Locust Avenue in Cortlandt, New York. With a team of experienced professionals, we provide a wide range of financial services tailored to meet the unique needs of our clients. From tax preparation and bookkeeping to investment planning and retirement strategies, our dedicated staff is committed to helping individuals and businesses achieve their financial goals. Trust Exclusive Financial Services Ltd. to provide you with personalized and expert financial guidance.
Kir Tax Services
Kir Tax Services is a reputable accounting and finance institution located at 47 Mamaroneck Avenue in White Plains, New York. With a team of experienced professionals, we offer a wide range of tax services to individuals and businesses. Our goal is to provide expert guidance and support to help our clients navigate the complex world of taxes and finances. Whether you need help with tax preparation, planning, or consulting, Kir Tax Services is here to assist you every step of the way. Contact us today to schedule a consultation and see how we can help you achieve your financial goals.
Westhill Accounting and Tax Services
Westhill Accounting and Tax Services is a reputable institution located at 500 Mamaroneck Avenue in Harrison, New York. Specializing in accounting and finance, our team of experts is dedicated to providing top-notch services to individuals and businesses alike. With a commitment to accuracy and efficiency, we offer a wide range of services including tax preparation, bookkeeping, payroll management, and financial consulting. Trust Westhill Accounting and Tax Services to handle all of your financial needs with professionalism and expertise.
Eckstein Tax Services
Eckstein Tax Services is a leading accounting and finance institution located at 755 New York Avenue in Huntington, New York, United States. With a team of experienced professionals, we offer a wide range of tax services to individuals and businesses, including tax preparation, planning, and consulting. Our dedicated staff is committed to providing personalized and reliable financial solutions to help our clients achieve their financial goals. Contact us today to learn more about how Eckstein Tax Services can assist you with all your tax and financial needs.
Liberty Tax Services
Liberty Tax Services is a trusted accounting and finance institution located at 25 East Main Street in Elmsford, New York. Our team of experts is dedicated to providing top-notch tax preparation and financial services to individuals and businesses in the area. With our professional guidance and personalized approach, we strive to help our clients achieve their financial goals and maximize their returns. Visit us today to experience the Liberty Tax Services difference.
Soloway Advisory - Tax Preparation Service
Soloway Advisory is a professional tax preparation service located at 4667 Nesconset Highway in Port Jefferson Station, New York. Specializing in accounting and finance, our team of experts is dedicated to helping individuals and businesses navigate the complexities of tax laws and regulations. Whether you need assistance with filing your personal taxes or require comprehensive financial planning for your company, Soloway Advisory is here to provide reliable and efficient services. With a commitment to excellence and personalized attention, we strive to ensure our clients maximize their tax savings and achieve their financial goals. Contact us today to schedule a consultation and experience the difference our expertise can make for your financial future.
Howard S Cohen PC, CPA - Tax Preparation & Accounting Services
Howard S Cohen PC, CPA is a trusted institution offering top-notch tax preparation and accounting services in Miller Place, New York. With years of experience in the field of accounting and finance, Howard S Cohen PC, CPA provides expert guidance and support to individuals and businesses in managing their finances efficiently. Located on Route 25A, this institution is known for its professionalism, accuracy, and dedication to helping clients navigate the complex world of taxes and accounting. Whether you need assistance with tax preparation, bookkeeping, or financial planning, Howard S Cohen PC, CPA is the go-to choice for all your accounting needs.
Tax Advisory Group
The Tax Advisory Group is a leading accounting and finance institution located at 223 Main Street in Port Washington, New York, United States. Our team of experienced professionals provides expert guidance and support in all areas of tax advisory services. Whether you are an individual or a business owner, we are here to help you navigate the complex world of taxes and financial planning. Trust the Tax Advisory Group to provide you with personalized and comprehensive solutions to meet your financial goals.
Maria Zoll Tax & Advisory Services, Inc.
Maria Zoll Tax & Advisory Services, Inc. is a reputable accounting and finance institution located at 382 Larkfield Road in East Northport, New York. With a team of experienced professionals, we provide a wide range of services including tax preparation, financial planning, and advisory services. Our goal is to help individuals and businesses navigate the complexities of the financial world and achieve their financial goals. Trust Maria Zoll Tax & Advisory Services, Inc. for all your accounting and finance needs.
AATC - Accounting, Advisory, Tax & Consulting Services
AATC - Accounting, Advisory, Tax & Consulting Services is a leading institution located at 3640 White Plains Road in New York, United States. Specializing in accounting, finance, tax, and advisory services, AATC offers a wide range of professional services to individuals and businesses. With a team of experienced professionals, AATC is dedicated to providing high-quality financial solutions tailored to meet the unique needs of each client. Whether you need help with tax preparation, financial planning, or business consulting, AATC is here to assist you every step of the way. Trust AATC to help you navigate the complexities of the financial world and achieve your goals with confidence.
- professional advisory services in Albany
- professional advisory services in Amherst
- professional advisory services in Amityville
- professional advisory services in Armonk
- professional advisory services in Babylon
- professional advisory services in Baldwin
- professional advisory services in Batavia
- professional advisory services in Bay Shore
- professional advisory services in Bedford Hills
- professional advisory services in Bellmore
- professional advisory services in Bethpage
- professional advisory services in Binghamton
- professional advisory services in Brewster
- professional advisory services in Briarcliff Manor
- professional advisory services in Bronxville
- professional advisory services in Buffalo
- professional advisory services in Canton
- professional advisory services in Carle Place
- professional advisory services in Carmel Hamlet
- professional advisory services in Chappaqua
- professional advisory services in Cheektowaga
- professional advisory services in Cicero
- professional advisory services in Clarence
- professional advisory services in Clayton
- professional advisory services in Cohoes
- professional advisory services in Commack
- professional advisory services in Cortlandt
- professional advisory services in Croton-on-Hudson
- professional advisory services in Deer Park
- professional advisory services in Delmar
- professional advisory services in Depew
- professional advisory services in Dobbs Ferry
- professional advisory services in Dunkirk
- professional advisory services in East Aurora
- professional advisory services in East Greenbush
- professional advisory services in East Meadow
- professional advisory services in East Northport
- professional advisory services in East Rochester
- professional advisory services in East Syracuse
- professional advisory services in Ellenville
- professional advisory services in Elmont
- professional advisory services in Elmsford
- professional advisory services in Endicott
- professional advisory services in Fairport
- professional advisory services in Farmingdale
- professional advisory services in Fayetteville
- professional advisory services in Fishkill
- professional advisory services in Floral Park
- professional advisory services in Franklin Square
- professional advisory services in Fredonia
- professional advisory services in Freeport
- professional advisory services in Fulton
- professional advisory services in Garden City
- professional advisory services in Geneseo
- professional advisory services in Glen Cove
- professional advisory services in Glens Falls
- professional advisory services in Goshen
- professional advisory services in Gouverneur
- professional advisory services in Grand Island
- professional advisory services in Great Neck
- professional advisory services in Hamburg
- professional advisory services in Harrison
- professional advisory services in Hauppauge
- professional advisory services in Haverstraw
- professional advisory services in Hawthorne
- professional advisory services in Hempstead
- professional advisory services in Hicksville
- professional advisory services in Hilton
- professional advisory services in Hopewell Junction
- professional advisory services in Hudson
- professional advisory services in Hudson Falls
- professional advisory services in Huntington
- professional advisory services in Huntington Station
- professional advisory services in Jamestown
- professional advisory services in Jericho
- professional advisory services in Johnson City
- professional advisory services in Kingston
- professional advisory services in Lakewood
- professional advisory services in Larchmont
- professional advisory services in Latham
- professional advisory services in Lawrence
- professional advisory services in Levittown
- professional advisory services in Liberty
- professional advisory services in Lindenhurst
- professional advisory services in Lockport
- professional advisory services in Long Beach
- professional advisory services in Lynbrook
- professional advisory services in Mahopac
- professional advisory services in Mamaroneck
- professional advisory services in Manhasset
- professional advisory services in Massapequa
- professional advisory services in Massapequa Park
- professional advisory services in Massena
- professional advisory services in Medina
- professional advisory services in Melville
- professional advisory services in Merrick
- professional advisory services in Middletown
- professional advisory services in Monroe
- professional advisory services in Monsey
- professional advisory services in Montgomery
- professional advisory services in Monticello
- professional advisory services in Mount Kisco
- professional advisory services in Mount Vernon
- professional advisory services in Nanuet
- professional advisory services in New City
- professional advisory services in New Hartford
- professional advisory services in New Hyde Park
- professional advisory services in New Paltz
- professional advisory services in New Rochelle
- professional advisory services in New Windsor
- professional advisory services in Newburgh
- professional advisory services in Niagara Falls
- professional advisory services in North Babylon
- professional advisory services in North Syracuse
- professional advisory services in Northport
- professional advisory services in Nyack
- professional advisory services in Oceanside
- professional advisory services in Olean
- professional advisory services in Oneida
- professional advisory services in Orchard Park
- professional advisory services in Ossining
- professional advisory services in Oswego
- professional advisory services in Oyster Bay
- professional advisory services in Pearl River
- professional advisory services in Peekskill
- professional advisory services in Penfield
- professional advisory services in Pine Bush
- professional advisory services in Pittsford
- professional advisory services in Plainview
- professional advisory services in Plattsburgh
- professional advisory services in Pleasantville
- professional advisory services in Pomona
- professional advisory services in Port Chester
- professional advisory services in Port Jefferson
- professional advisory services in Port Jefferson Station
- professional advisory services in Port Jervis
- professional advisory services in Port Washington
- professional advisory services in Potsdam
- professional advisory services in Poughkeepsie
- professional advisory services in Pulaski
- professional advisory services in Queensbury
- professional advisory services in Rensselaer
- professional advisory services in Rhinebeck
- professional advisory services in Rochester
- professional advisory services in Rockville Centre
- professional advisory services in Rome
- professional advisory services in Roslyn
- professional advisory services in Roslyn Heights
- professional advisory services in Rye
- professional advisory services in Rye Brook
- professional advisory services in Saint James
- professional advisory services in Salamanca
- professional advisory services in Salina
- professional advisory services in Saratoga Springs
- professional advisory services in Scarsdale
- professional advisory services in Schenectady
- professional advisory services in Seaford
- professional advisory services in Setauket- East Setauket
- professional advisory services in Sleepy Hollow
- professional advisory services in Smithtown
- professional advisory services in Spencerport
- professional advisory services in Spring Valley
- professional advisory services in Springville
- professional advisory services in Stony Brook
- professional advisory services in Stony Point
- professional advisory services in Suffern
- professional advisory services in Syosset
- professional advisory services in Syracuse
- professional advisory services in Tarrytown
- professional advisory services in Ticonderoga
- professional advisory services in Tonawanda
- professional advisory services in Troy
- professional advisory services in Uniondale
- professional advisory services in Utica
- professional advisory services in Valhalla
- professional advisory services in Valley Stream
- professional advisory services in Vestal
- professional advisory services in Victor
- professional advisory services in Wantagh
- professional advisory services in Wappingers Falls
- professional advisory services in Warsaw
- professional advisory services in Warwick
- professional advisory services in Watertown
- professional advisory services in Webster
- professional advisory services in West Babylon
- professional advisory services in West Hempstead
- professional advisory services in West Islip
- professional advisory services in West Nyack
- professional advisory services in West Seneca
- professional advisory services in Westbury
- professional advisory services in Westfield
- professional advisory services in White Plains
- professional advisory services in Williamsville
- professional advisory services in Williston Park
- professional advisory services in Woodbury
- professional advisory services in Yonkers
- professional advisory services in Yorktown Heights
List of local businesses, places and services in New York
⭐ business help 🔍 services ☎ phones 🕒 opening times ✍️reviews 🌍 addresses, locations 📷 photos