Remarks
GRACE is a joint partnership between the National Aeronautics and Space Administration (NASA) in the United States and Deutsches Zentrum fuer Luft und Raumfahrt (DLR) in Germany. Prof. Byron Tapley of the University of Texas Center for Space Research (UTCSR) is the Principal Investigator (PI), and Dr.-Ing. Frank Flechtner of the GeoForschungsZentrum (GFZ) Potsdam is the Co-Principal Investigator (Co-PI).