Professor (Not Currently Accepting New Graduate Students)
Colorado Center for Astrodynamics Research (CCAR)

Office Location: ECAE 177, ECAE 1B97 (lab)

Focus Area

Astrodynamics & Satellite Navigation
Remote Sensing, Earth, & Space Sciences


Ph.D., Geophysics, Scripps Institution of Oceanography, University of California, San Diego, 1990
B.A., Engineering Sciences, Harvard University, 1985

Professional Experience

2004-present, Professor, Aerospace Engineering Sciences, University of Colorado
1997-2004, Associate Professor, Aerospace Engineering Sciences, University of Colorado
1998-1999, Visiting Associate Professor of Geophysics, Stanford University
1998, Visiting Scientist, Hawaii Volcano Observatory
1990-1997, Assistant Professor, Aerospace Engineering Sciences, University of Colorado
1993, Visiting Scientist, NASA Goddard Space Flight Center
1993, Visiting Scientist, U.S. Geological Survey
1988-1990, Member Technical Staff, Jet Propulsion Laboratory

Awards (selected)

Governor's Award for High Impact-Research (2017)
Christiaan Huygens Medal, International European Geosciences Union (2015)
The Prince Sultan Bin Abdulaziz International Creativity Prize for Water (Joint Recipient) (2014)
American Geophysical Union Fellow (2011)
150th Jubilee Visiting Professorship, Chalmers University of Technology (Summer 2011)
Bowie Lecture, AGU Geodesy Section, 2007
Faculty Fellowship, 2005-2006, 2010-2011 
AGU Geodesy Section Award, 2005

Research Interests

Applications of GPS, incl. navigation, positioning, precise orbit determination, earthquakes, volcanoes, soil moisture, snow depth, and vegetation sensing.