Dr. Muennig's work primarily focuses on the cost-effectivenss of competing medical and non-medical social policies in improving population health. He uses randomized trials and cost-effectiveness analyses together to develop causal models to study the most efficient mix of medical and non-medical policies for maximizing health in the U.S. and elsewhere. His work has focused on education interventions, housing, health systems, immigration, environmental policies and welfare policies. He has also worked as a consultant for the Centers for Disease Control and Prevention, the Canadian government, and the Chinese government on immigration policy, health system development, and urban health. He has been published over 70 research papers and has authored two textbooks on cost-effectiveness analysis. His work has appeared on NPR, CNN, MSNBC and multiple times in major print media sources, such as the New York Times, Wall Street Journal, and Slate.