| 2011 | HydroGeoLogic, Inc., Reston, VA. |
| 2011 | Eastern Research Group, Inc., Lexington, MA. |
| 2010 – present | The Haisla Nation, Canada. |
| 2009 – 2010 | United Nations, Nairobi, Kenya. |
| 2009 | Sonoran Institute, Arizona. |
| 2008 – 2009 | HOK, Washington, DC. |
| 2008 – 2009 | Asia Development Bank Institute, Tokyo, Japan. |
| 2008 – 2009 | Chalmers University of Technology, Gothenburg, Sweden. |
| 2008 | Union of Concerned Scientists, Cambridge, Massachusetts. |
| 2008 | Environmental Defense, Washington DC. |
| 2008 | OECD/International Energy Agency, Paris, France. |
| 2008 | National Resources Defense Council, Washington, DC. |
| 2008 | Center for Climate Strategies (CCS), Washington, DC. |
| 2008 | Distributed Energy Financial Group (DEFG), Washington, DC. |
| 2007 – 2008 | National Aeronautic and Space Agency (NASA) Goddard Space Flight Center, Greenbelt, Maryland. |
| 2007 – 2008 | High Road Strategies, Arlington, Virginia. |
| 2007 | The Conservation Fund, Washington DC and The Resnick Group, Baltimore, Maryland. |
| 2006 – 2007 | ICF Consulting, Fairfax, Virginia. |
| 2006 | Duke University, Nichols School of the Environment, Chapel Hill, North Carolina. |
| 2005 | The Conservation Fund, Washington DC and The Resnick Group, Baltimore, Maryland. |
| 2004 | OECD/International Energy Agency, Paris, France. |
| 2002 – 2003 | Management Systems International, Washington, D.C. |
| 2000 | National Oceanographic and Atmospheric Administration, U.S. Department of Commerce, Washington, D.C. |
| 1994 – 2003 | Consultant, Roy F. Weston, Inc., West Chester, Pennsylvania. |
| 1992 | Consultant, Environmental Planning and Economics Inc., Springfield, Illinois. |
| 1986 – 1989 | Consultant, Systeam K.G. Dr. Winterstein, Karlsruhe, Federal Republic of Germany. |