Honors and Awards:
Texas Institute for Computational Mechanics (TICOM) Fellowship, 1975-1976.
University of Texas Fellowship, 1976-1977.
NASA Group Achievement Award for the TOPEX/POSEIDON Mission Design, 1993.
NASA Group Achievement Award for the Joint Gravity Model-1 (JGM-1), 1993.
NASA Public Service Group Achievement Award, TOPEX/POSEIDON Precision Orbit Determination Team, 1994.
NASA Group Achievement Award, TOPEX/POSEIDON Flight Operations Team, 1994.
NASA/CNES Certificate of Appreciation for TOPEX/POSEIDON three-year prime mission, 1995.
NASA Group Achievement Award, Gravity Recovery and Climate Experiment Project Team, 2003.
NASA Exceptional Technology Achievement Medal, 2010
Membership and service in technical and professional organizations:
Fellow, International Association of Geodesy.
Member, American Geophysical Union.
Member, American Astronomical Society and AAS Division on Dynamical Astronomy.
ILRS representative to the IERS Conventions Advisory Board, 2004-Present.
Member, Global Geodetic Observing System (GGOS) Bureau for Networks and Observations (previously the GGOS Working Group on Ground Networks and Communications), 2005-Present.
IDS representative to the GGOS Bureau for Products and Standards, 2013-Present.
Member, IAG Commission 1 Steering Committee, 2003-2011.
Member, IAG Commission I Working Group, IC-WG1.2: Precise Orbit Determination and Reference Frame Definition, 2007-2011.
Member, Journal of Geodesy Editorial Board, 2007-2015.
Member, International DORIS Service (IDS) Governing Board, 2003-2014.
Member, Gravity Probe-B Science Advisory Committee, 1999-2011.
Member, National Research Council Committee on the National Requirements for Precision Geodetic Infrastructure, 2008-2010.
Member, IGeS Working Group on Geoid Evaluation, 2000-2008.
Member, Working Group (WG) on Relativity for Celestial Mechanics, Astrometry and Metrology (RCMAM), 2003-2006.
Member, TOPEX Precision Orbit Determination Verification Team, 1990-2003.
Chairman, IAG Special Study Group on Non-Gravitational Force Modelling Effects on Satellite Orbits, 1991-1995.
Member, IAG Special Study Group on Precise Orbits Using Multiple Space Techniques, 1991-1999.
Member, IAU Working Group on Reference Systems; Subgroup on Astronomical Constants, 1991-1999.
Member, IAG Special Commission 3 on Fundamental Parameters, 1994-2003.
Member, Working Group (WG) on Relativity in Celestial Mechanics and Astrometry (RCMA), 1997-2001.
Member, BIPM and IAU Joint Committee on Relativity in Celestial Mechanics and Astrometry, 1997-2000.
Member, CSTG/IERS DORIS Pilot Experiment Steering Group (also one of two representatives to IERS Extended Directing Board), 1999-2003.
Member, IAG Earth Tide Commission Working Group 6: Solid Earth Tides in Space Geodetic Techniques (DORIS sub-group), 1999-2003.
Session Co-Chair, Spring Meeting of the American Geophysical Union, 1993, 1994, 1996.
Session Co-Chair, Fall Meeting of the American Geophysical Union, 1999.
Session Co-Convener, EGS 2000, Nice, France, April 24-29, 2000.
Scientific Committee, DORIS Days, Toulouse, France, May 2-3, 2000.
Organizing Committee, IDS Workshop, Marne la Vallée, France, February 20-21, 2003.
Scientific Organizing Committee, IERS Workshop on Conventions, Paris, France, September 20-21, 2007.
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