the IPCC Fourth Assessment Report. He is a fellow of the International Association of Geodesy and the American Association for the Advancement of Science. He is a recipient of the European Geosciences Union’s Vening Meinesz Medal for distinguished research in geodesy, and of several NASA awards for his work on the TOPEX/POSEIDON and GRACE missions. He received his B.S. and Ph.D. in aerospace engineering from the University of Texas, Austin.

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