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received his Ph.D. from Cornell University in in 1976. He has worked as a
geophysicist at NASA, and, since 1984, at NOAA, serving as Chief of the
Geodynamics Branch from 1990 to 2000. His recent research has focused on
polar geodynamics including derivation of marine gravity from satellite
altimetry over ice-covered polar seas. He is a member of American
Geophysical Union, a co-investigator on the CryoSat Calibration-Validation
team and is serving on the GRACE Science Team for the NASA/DLR Gravity
Recovery and Climate Experiment (GRACE).