Professor Srinivas Bettadpur is one of a handful of individuals who helped invent a new method for measuring temporal changes in Earth’s gravitational field, resulting in the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On satellite missions. These missions have ushered in a new paradigm for monitoring changes in Earth’s water reservoirs due to climate change. In this context, he is unique in the ability to seamlessly bridge technology and aerospace disciplines in service to spaceborne measurement architectures and analysis techniques for geodesy and the Earth sciences. He has made pioneering contributions to the complex data analyses that underlie the extraction of mass change from gravity field sensing, spanning from the detailed numerical algorithms for satellite data analysis to the assimilation of mass change data into numerical models of the Earth system. His unique and pioneering innovations in geodesy have advanced the entire field, seamlessly bridging between advancing technologies and evolving scientific needs over the decades. His early work in characterization and mitigation of aliasing errors due to short-period modeling errors for GRACE led to improvements in models for ocean tides and nontidal atmosphere and ocean variability. That same thread continues unbroken today as he tackles the theory of aliasing for next-generation quantum sensing satellite gravity gradiometry. He is now at the forefront of the nascent field of the application of quantum sensing technologies to gravity field sensing from space. His contributions span from potential field sensing to the determination of the terrestrial reference frame and to promoting geodesy in service to disaster analytics. He has led the only group to have successfully produced Earth gravity field models from all existing spaceborne measurement systems for that purpose, including GRACE(-FO), the Gravity field and Ocean Circulation Explorer (GOCE), and numerous global navigation satellite system (GNSS)-tracked low-Earth orbiters. He is now leading the Quantum Pathways Institute, a new multiuniversity (NASA-sponsored) institute to develop next-generation quantum sensing techniques for measuring the gravity field. He has led the establishment of a new geodetic observatory in west Texas that ties together all the major geodetic techniques (satellite laser ranging, very long baseline interferometry, GNSS). Professor Bettadpur’s contributions truly span the “pillars of geodesy” (changes in Earth’s shape, gravity field and rotation), and as such he has had, and continues to have, a remarkable and growing impact on the field of geodesy.—R. Steven Nerem University of Colorado BoulderBoulder, Colorado