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About

Gustavo Niz is a key figure in observational cosmology, specializing in large-scale structure, dark energy, and the engineering challenges of precision spectroscopic surveys. His most impactful work centers on the Dark Energy Spectroscopic Instrument (DESI), a revolutionary project using 5,000 optical fibers to map tens of millions of galaxies and quasars. Niz co-authored the comprehensive overview of DESI’s fiber system (57 citations), detailing the hardware enabling unprecedented measurements of cosmic distances. He has also tackled a critical systematic effect in galaxy clustering: the “fiber assignment” problem, where hardware constraints create selection biases. His papers on producing alternate realizations of DESI’s fiber assignment (25 and 10 citations) provide essential correction methods for unbiased clustering measurements in both data and simulations. This work ensures that DESI’s maps of the universe yield accurate constraints on dark energy and cosmic expansion. Niz’s contributions bridge instrumental design and sophisticated data analysis, making him a vital contributor to one of the most ambitious cosmological surveys ever undertaken.