Michael P Hahalyak, DO Dr. Hahalyak cares for individuals of all ages who have chronic conditions or are suffering acute illnesses or injuries. He is skilled at osteopathic manipulation and joint injections. After earning his degree at Philadelphia College of Osteopathic Medicine in Philadelphia, Pennsylvania, Dr. Hahalyak completed his residency at Shadyside Hospital, University of Pittsburgh Medical Center. Dr. Hahalyak sees patients at AHN Forbes Hospital.