William Lee Hasler MD

Dr. William Hasler, MD is a gastroenterologist at Mayo Clinic, Phoenix, Arizona, United States. Dr. Hasler received his M.D. degree from the University of Pennsylvania in 1983. His postgraduate education included internal medicine and gastroenterology training at the University of Michigan. Dr. Hasler joined the University of Michigan faculty as a lecturer upon the completion of his fellowship in 1989. He became an instructor in 1990. He was promoted to assistant professor in 1993, associate professor in 1998, and professor in 2007.