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Welcome to the practice of John J. Brennan, MD, a distinguished orthopedic surgeon dedicated to providing exceptional care in Riverhead, New York. Located at 715 Roanoke Avenue, Dr. Brennan brings extensive expertise and a compassionate approach to treating a wide range of orthopedic conditions. Dr. John Brennan earned his medical degree from SUNY Health Science Center at Brooklyn after completing his undergraduate studies at St. Louis University. He honed his skills through a surgical internship and orthopedic residency at St. Luke’s-Roosevelt Hospital Center in Manhattan. His training included rotations at prestigious institutions such as Alfred I. DuPont Children’s Hospital, Memorial Sloan-Kettering Cancer Center, and The Blackrock Clinic in Dublin, Ireland.