Isaac Held retired in 2020 from the Geophysical Fluid Dynamics Laboratory of the National Oceanic and Atmospheric Administration on Princeton’s Forrestal Campus, and from teaching in the Atmospheric and Oceanic Sciences (AOS) Program, but retains an affiliation with AOS. He is an HMEI (High Meadows Environmental Institute) and a PACM (Program in Applied and Computational Mathematics) Associated Faculty. His research covers climate modeling and atmospheric and oceanic fluid dynamics, specifically the theory for the large-scale structure of the atmospheric circulation. He has written extensively and continues research on various aspects of climate change, including the hydrological cycle and tropical cyclones. He was elected to the United States National Academy of Sciences in 2003.