2023 - present: Director, Institute for Decarbonization and Energy Advancement, Professor, Department of Mechanical Engineering, University of Kentucky
2016 - 2023: Associate Director for Research, Center for Applied Energy Research; Associate Professor, Department of Mechanical Engineering, University of Kentucky
2014 - 2016: Associate Director for Research, Center for Applied Energy Research; Associate Research Professor, Department of Mechanical Engineering, University of Kentucky
2005 - 2014: Program Manager, Associate Director, Associate Director for Research, Center for Applied Energy Research, University of Kentucky
2004 - 2005: Advisory Engineer, Research Center, The Babcock & Wilcox Company, OH
2002 - 2004: Associate Professor, tenure-track, Department of Architecture and Manufacturing Science; Manager of Combustion Laboratory, Western Kentucky University
2001 - 2002: Senior Engineer I, Fossil Program, Power Generation Technologies
1997 - 2001: Research Associate (visiting scholar), Combustion Laboratory Manager, Department of Chemistry, Western Kentucky University
1993 - 1997: Research Engineer, Associate Professor (tenure-track), Thermoenergy Engineering Research Institute, Southeast University