| 2009 - | Director, Clean Energy Research Institute, University of Miami |
| 2005 - | Professor, University of Miami |
| 2007 - 2010 | Chang Jiang Scholar Professor, P.R China and Li Ka Shing Foundation |
| 2008 - 2009 | Associate Director, Clean Energy Research Institute, University of Miami |
| 2001 - 2005 | Associate Professor, University of Miami |
| 1997 - 2001 | Assistant Professor, University of Miami |
| 1996 - 1997 | Senior Research Engineer, Energy Partners, Inc. |
| 1995 - 1996 | Research Assistant Professor, University of Miami |
| 1994 - 1995 | Research Associate, University of Miami |
| 1990 - 1991 | Research Fellow, Technical Institute of Munich |
| 1982 - 1987 | Associate Lecturer, Shenyang Jianzhu University |
