Dr. Mark Jagust is a family medicine doctor in Lake Grove, New York and is affiliated with multiple hospitals in the area, including John T. Mather Memorial Hospital and Mercy Medical Center. Dr Mark Jagust received his medical degree from St. George's University School of Medicine, St. George's Grenada. He later completed his residency in Family Medicine at Southside hospital. Dr. Mark Jagust has been in practice for more than 20 years.