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About

Johan Comparat is a leading astrophysicist whose work centers on large-scale structure, dark energy, and the evolution of galaxies across cosmic time. He has made pivotal contributions to two of the most ambitious spectroscopic surveys ever undertaken. As a key member of the Dark Energy Spectroscopic Instrument (DESI) collaboration, Comparat helped design and implement the instrument that now maps tens of millions of galaxies and quasars. His work on DESI’s instrument design—detailed in a paper with over 230 citations—enables precise measurements of baryon acoustic oscillations and redshift-space distortions, directly probing the nature of dark energy. More recently, Comparat is advancing the Sloan Digital Sky Survey-V (SDSS-V), the first all-sky, multi-epoch, optical-to-infrared spectroscopic survey. This pioneering "panoptic" approach will revolutionize our understanding of black hole growth, stellar evolution, and the Milky Way’s structure. With a career defined by building the next generation of cosmological tools, Comparat’s impact is measured not only in citations but in the fundamental data that will shape astrophysics for decades.