Dr. St. Julien specializes in family medicine and sports medicine. He treats patients for concussion, osteoarthritis, sports injuries, musculoskeletal pain, and general health needs. He is skilled at providing ultrasound guided musculoskeletal injections.

Dr. St. Julien is a team physician for Edinboro University, Girard High School, and Northwestern High School, and also provides medical supervision for the Barber Beast on the Bay obstacle course at Presque Isle State Park, and a Medicine Preceptorship at LECOM, all in the Erie, Pennsylvania region. He speaks English.