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About

Mehdi Rezaie is a key figure in modern observational cosmology, specializing in the engineering and data analysis behind massive spectroscopic surveys. His primary research focuses on the Dark Energy Spectroscopic Instrument (DESI), a revolutionary project that uses 5,000 optical fibers to create the largest 3D map of the universe. Rezaie’s major contributions center on the instrument’s hardware and calibration—he co-authored the definitive overview of the DESI fiber system (57 citations) and led work on its astrometric calibration, ensuring the precise positioning of 5,020 robotic fiber positioners. Critically, he has tackled one of the most stubborn systematic errors in large-scale structure analysis: correcting for the angular selection biases imposed by fiber assignment. His papers on producing alternate realizations of DESI fiber assignment (25 and 10 citations) provide the statistical framework to remove these biases from clustering measurements, enabling unbiased cosmological inference. This work is essential for DESI’s core mission to measure dark energy and cosmic distances. Rezaie’s research bridges the gap between instrument performance and robust data analysis, making him a vital contributor to the next generation of precision cosmology.