Steven Gribar, MD, FACS Dr. Steven Gribar is a general surgeon with AHN Surgery Institute, specializing in robotic, laparoscopic, and minimally invasive surgical procedures. Dr. Gribar received his medical degree from the University of Pittsburgh School of Medicine in Pittsburgh, Pennsylvania. He completed both his residency University of Pittsburgh School of Medicine and his internship in general surgery at University Health Center of Pittsburgh. Dr. Gribar is certified by the American Board of Surgery. He has been widely published for his research and work in surgical procedures and gastroenterology. He treats patients ages 18 and older.