Tyner has done extensive research on the economics of different energy sources.  He has examined economic and policy issues related to ethanol and other renewable fuels from agricultural sources. Her has expertise in international trade agreements such as GATT and NAFTA and in long-term macroeconomic issues.  Tyner  specializes in policy analysis related to resource economics. He conducts research and  programs on recycling and solid-waste management, market economies (such as in Eastern Europe).  Tyner has extensive international experience and has worked with USAID, USDA-PASA, the World Bank, and the Hudson Institute, among others.