Dr. O'Sullivan graduated from Charing Cross & Westminster Medical Schools in 1991 and has been in practice for 26 years. He completed a residency at Stanford University School of Medicine. He currently practices at Doctors Park of Mt Shasta and is affiliated with Asante Ashland Community Hospital, Fairchild Medical Center and Mercy Medical Center Mount Shasta. Dr. O'Sullivan accepts multiple insurance plans including Aetna, Medicare and PacifiCare (UnitedHealthcare). Dr. O'Sullivan is board certified in Orthopaedic Surgery. Dr. O'Sullivan also practices at Ashland Orthopedic Associates LLP in Ashland, OR.