Dr. Duell's special areas of interest include lipid disorders (e.g. high cholesterol), metabolic disorders, homocysteine metabolism, prevention of atherosclerosis (heart disease), diabetes, endocrinology and management of obesity. He currently serves as the director of OHSU's Metabolic Disorders Clinic. He received his medical degree from OHSU in 1983, and completed his Medicine residency at OHSU and the University of Chicago. He completed his Metabolism, Endocrinology and Nutrition fellowship at the University of Washington in Seattle.