 Nature, 2005), and played a significant role in many others.The mission has characterized the afterglow and origin of short GRB for the first time, determine the shape of the X-ray and optical afterglow lightcurves to great precision and with large statistics (>1000 GRBs), provided a comprehensive data set of UV observation of supernova, and discovered X-ray outbursts from supernova shock breakouts and relativistically beamed tidal disruption events.For Fermi, Gehrels worked with lead scientists at Goddard, Stanford, the United States Naval Research Laboratory, and several other institutions to propose the mission and bring it to fruition.