Elizabeth Cochran has made transformative scientific advances in earthquake early warning, induced seismicity, and fault zone structure, and she has provided outstanding service to science and society. Elizabeth’s pioneering approaches to earthquake early warning have made it possible to more accurately forecast, within seconds after a big earthquake has begun, how strongly the ground will shake. She started her investigations with a visionary citizen science project she implemented in multiple countries to use low- to no-cost sensors to detect earthquakes and their ground motions. Since then, she has led and developed sophisticated new techniques and analyses to guide the advanced framework and technology of the U.S. Geological Survey’s (USGS) Earthquake Early Warning ShakeAlert system. The result is earthquake early warnings in the United States now delivered to millions of people for noticeable shaking caused by moderate to large earthquakes in California, Oregon, and Washington. Elizabeth has also led pioneering, transformative work in the field of induced seismicity, earthquakes that rupture due to human activities altering the stress state on long-dormant faults, and she has published guidance for the future. Among her novel approaches is her use of large-N seismic instrumentation. Her work linked the largest known earthquake in Oklahoma to wastewater disposal, challenging the then common perception that earthquakes caused by deep disposal are size limited. She served a highly significant role, delivering her groundbreaking science findings to regulatory agencies, industry, and the public. For more than two decades, Elizabeth has conducted innovative field experiments and used the data to image fault zone structure. Her high-impact work includes illuminating near-fault damage zone regions both shallow and deep, overturning others’ ideas that fault zone deformation is only shallow. She was among the first to detect the subtle effect of Earth’s tides on earthquake occurrence. Her work collaborating with machine learning experts demonstrated how aftershocks illuminate not a planar fault surface, but instead a corrugated structure, revising our view of Earth’s active crust. Elizabeth has dedicated her efforts to the community and to AGU. She is the AGU Seismology section secretary and served 6 years as a Journal of Geophysical Research associate editor. In addition, she has served important roles in the community organizations SCEC and Earthscope. Elizabeth has guided many students and postdocs, and she adeptly led, for months during the COVID-19 pandemic, the more than 150 employees of the Earthquake Science Center. Elizabeth champions uplifting the next generation. Among her accomplishments is a USGS student summer internship program she coinitiated and continues to colead. The Joanne Simpson Medal honors Elizabeth’s many notable achievements. —Ruth A. Harris, U.S. Geological Survey, Moffett Field, California