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Amir Aghamousa is a key contributor to the forefront of observational cosmology, with his research centered on dark energy, large-scale structure, and the design of next-generation spectroscopic instruments. He is best known for his integral role in the Dark Energy Spectroscopic Instrument (DESI) project, a Stage IV ground-based experiment designed to unravel the mysteries of cosmic acceleration. Aghamousa’s major contributions are encapsulated in his highly cited work, “The DESI Experiment Part II: Instrument Design” (2016), which has garnered over 234 citations. This paper details the revolutionary robotically-actuated fiber positioning system that enables DESI to conduct a wide-area galaxy and quasar redshift survey, precisely mapping baryon acoustic oscillations and redshift-space distortions. Through this work, Aghamousa has helped lay the technical foundation for one of the most ambitious surveys of cosmic structure ever undertaken, directly advancing our understanding of the universe’s expansion history. His achievements underscore a career dedicated to bridging cutting-edge instrumentation with fundamental cosmological questions, making him a notable figure in modern astrophysics.