Professional Experience
| January 2010 - present | Director, Environmental Engineering Graduate Program, Civil and Environmental Engineering, University of Houston, Houston, TX |
| September 2007 - present | Professor, Civil and Environmental Engineering, Cullen College of Engineering, University of Houston |
| 2001 - 2007 | Associate Professor, Civil and Environmental Engineering, Cullen College of Engineering, University of Houston |
| 1997 - 2001 | Assistant Professor, Civil and Environmental Engineering, Cullen College of Engineering, University of Houston |
| 1997 - 1998 | Adjunct Assistant Professor, Rice University |
| 1994 - 1997 | Executive Director, Energy and Environmental Systems Institute, Rice University |
| 1994 - 1997 | Faculty Fellow, Environmental Science and Engineering, Rice University |
| 1989 - 1994 | Research Associate, Environmental Science and Engineering, Rice University |
| 1986 - 1989 | Doctoral Research Assistant, Environmental Science and Engineering, Rice University |