Dr. Zeng is a health economist and physician. He has about 15 years' experience of conducting studies on: health care systems, health financing, and cost-effectiveness analysis in both developed and developing countries. Many of his research studies have concerned comparative evaluation of policies, programmes, and interventions in improving access and utilisation of health services, and health outcomes, as well as associated resources.
His other research interest focuses on examining fund flow in the health care system, to identify efficiency gaps and promote the efficiency of programmes. He has worked on Public Expenditure Tracking Survey and National Health Accounts in Afghanistan.
Dr. Zeng has conducted research in: Afghanistan, China, Haiti, the Republic of Congo, Rwanda, Ethiopia, Singapore, the United States, and Uzbekistan. His research has received support from the World Bank, USAID, UNAIDS, the Gates Foundation, the Centers for Medicare & Medicaid Services, and the Robert Wood Johnson Foundation.