| 2007-present |
Senior Research Scientist |
Space Science Institute, Boulder CO |
| 2003-present |
Adjoint Professor of Physics & Astronomy |
San Francisco State University |
| 2007-2008 |
Instructor of Physics & Astronomy |
College of Marin, Kentfield, CA |
| 2000-2007 |
Research Scientist |
Space Science Institute, Boulder, CO |
| 2003-2004 |
NASA Summer Faculty Fellow |
Ames Research Center, Moffett Field, CA |
| 2001-2003 |
Lecturer |
Department of Physics & Astronomy, University of Southern California |
| 1997-2003 |
Visiting Scientist |
Jet Propulsion Laboratory |
| 1998-2000 |
NSF POWRE Visiting Professor |
Physics Department, Harvey Mudd College |
| 1993-1998 |
Assistant Professor |
Department of Physics, University of California, Riverside |
| 1990-1993 |
Smithsonian Institution Fellow |
Submillimeter Interferometry Group, Harvard-Smithsonian Center for Astrophysics |
| 1988-1990 |
President's Fellow |
Astronomy Department, University of California, Berkeley |