His practice focus is on breast reconstruction following mastectomy, particularly microsurgical breast reconstruction. Dr. Duffy was the first surgeon to perform the DIEP flap procedure in North Texas and particularly enjoys helping women who have had a failed prior breast reconstruction or have had a poor outcome elsewhere. Dr. Duffy practices in north Dallas. His primary office is at Medical City Dallas Hospital but he also operates at North Central Surgical Center, Star Medical Center in Plano, and Methodist Richardson Hospital, as well as other facilities.