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About

Julien Guy is a leading experimental cosmologist whose work is central to our understanding of dark energy and the large-scale structure of the universe. His primary research focuses on the design, implementation, and scientific exploitation of the Dark Energy Spectroscopic Instrument (DESI), a Stage IV ground-based experiment. Guy made foundational contributions to DESI’s instrument design, as detailed in his highly cited 2016 paper (234 citations), which describes the robotically-actuated fiber system enabling the survey’s unprecedented spectroscopic throughput. More recently, he achieved a landmark result with the first detection of the baryon acoustic oscillation (BAO) signal from early DESI data (2023, 37 citations), using a sample of 261,291 luminous red galaxies. This detection, obtained from just two months of unblinded observations, demonstrates DESI’s transformative power for precision cosmology. Guy’s work bridges cutting-edge instrumentation and fundamental physics, providing critical constraints on the nature of dark energy and the growth of cosmic structure. His contributions are shaping the next generation of cosmological surveys.