His research focuses on the constraints that vulnerable populations face in making decisions that affect their health status, as well as the effects of government policies and programs designed to benefit vulnerable populations. He has published empirical economics and health services research on the elderly, adolescents, HIV/AIDS and managed care. Most recently, he has researched the regulation of the viatical-settlements market (a secondary life-insurance market that often targets HIV patients) and summer/winter differences in nutritional outcomes for low-income American families. He is also working on a project examining the labor-market conditions that help determine why some U.S. employers do not provide health insurance.