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R. Alfarsy is a key contributor to the Dark Energy Spectroscopic Instrument (DESI), one of the most ambitious cosmological surveys ever undertaken. Their research centers on dark energy, galaxy evolution, and large-scale structure, with a focus on the instrumentation and data analysis that make such transformative science possible. Alfarsy’s most cited work, the 2022 overview of DESI’s instrumentation, has already garnered 10 citations, reflecting its foundational role in the project. This paper details the technical design and capabilities of DESI, which is now conducting a five-year survey of 40 million galaxies and quasars to map the universe’s expansion history using baryon acoustic oscillations. By helping to build and calibrate the instrument that will measure redshifts with unprecedented precision, Alfarsy is enabling breakthroughs in our understanding of dark energy’s nature. Their work exemplifies the critical intersection of engineering and astrophysics, and as DESI’s data pours in, their contributions will be essential to interpreting one of the most important cosmological datasets of the decade.