Board certification in internal medicine in 1983 and endocrinology and metabolism in 1986. Dr. Ahmann received a masters degree in pharmacy from North Dakota State University in 1976 after completing a clinical pharmacy residency at the Palo Alto VA and Stanford University. He received his medical degree in 1980 from the University of Colorado School of Medicine in Denver, and completed his residency at the Fitzsimons Army Medical Center in Colorado. He completed his endocrinology and metabolism fellowship and research fellowship at Walter Reed Medical Center in Washington, D.C.

Dr. Ahmann has been very involved in community and national diabetes efforts to improve the lives of those with diabetes. He has volunteered at Gales Creek Camp in the past and then has volunteered each summer at the Chris Dudley Basketball Camp for kids with diabetes since 1998. He chaired the task force to develop the Oregon Diabetes Coalition, served as the first Chair of that organization and now serves on the executive committee. He was the medical chair of the Oregon Diabetes Collaborative and serves as President of the American Diabetes Association Portland Area Leadership Board.  He remains highly involved in teaching medical students, residents, and fellows as well as physician assistant students and pharmacy students. He has been involved in national diabetes projects with the American Diabetes Association, the American Association of Clinical Endocrinologists and the Endocrine Society. He received the Portland Area Juvenile Diabetes Research Foundation Hope Award in 2008.

He enjoys hiking, golfing and spending time with his two sons, daughters-in-law and grandson who live in the Portland area.