Dr. Zimmerman is the Vice Chairman Endocrinology Cleveland Clinic and Director of the Diabetes Center in the Department of Endocrinology, Diabetes & Metabolism. He was on the Board of Directors of the American Association of Clinical Endocrinology and is co-chairman of the Endocrinology Board Review Course Committee for the American Association of Clinical Endocrinology. He is currently on the CME committee of the Endocrine Society. He previously served as a member of the Meeting Steering Committee of the Endocrine Society for six years, Governmental Affairs Committee for three years, and the Clinical Affairs Committee for six years. He is on the Board of the Diabetes Association of Greater Cleveland. Previously, he was director of the Ochsner Diabetes Institute and Medical Director of the Division of Nutrition at the Ochsner Clinic in New Orleans, Louisiana.
- Diplomate, National Board of Medical Examiners, 1982
- Diplomate, Boards of Internal Medicine, 1984
- Board Certified, Endocrinology, 1987