Dr. Leff graduated in 1991 from the Des Moines University, College of Osteopathic Medicine, Des Moines, Iowa. He completed his residency in Internal Medicine in 1995 and his Fellowship in Gastroenterology in 1997 at The Western Pennsylvania Hospital in Pittsburgh, Pennsylvania.

Dr. Leff has been in practice in Arizona since coming here in 1997. He is on the Medical Advisory Board for the American Liver Foundation Southwest Chapter. He has a special interest in IBS and liver disease along with heartburn and colon cancer screening.