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About

E. Chaussidon is a key figure in observational cosmology, specializing in the instrumentation and data analysis for the Dark Energy Spectroscopic Instrument (DESI). Their work is central to understanding dark energy through the precise measurement of baryon acoustic oscillations (BAOs). Chaussidon led the first detection of the BAO signal from early DESI data (2023, 37 citations), a landmark result that validated the instrument’s performance and provided an early glimpse into the cosmic distance scale. They also spearheaded a critical study on fiber assignment incompleteness in DESI Data Release 1 (2025, 20 citations), developing mitigation methods essential for accurate two-point clustering measurements. Additionally, Chaussidon contributed to the comprehensive overview of DESI’s instrumentation (2022, 10 citations), detailing the robotic fiber positioners and spectrographs that enable the survey of 40 million galaxies and quasars. Their combined expertise in both hardware and analysis has been instrumental in advancing DESI’s mission to constrain the nature of dark energy, making Chaussidon a vital contributor to one of the most ambitious cosmological surveys ever undertaken.