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J. Lasker is a key figure in modern observational cosmology, specializing in the mitigation of systematic effects in large-scale structure surveys. Their primary research area is the correction of fiber assignment incompleteness—a critical hardware limitation in multi-object spectrographs like the Dark Energy Spectroscopic Instrument (DESI). Lasker’s major contribution is the development and production of alternate realizations of DESI’s fiber assignment, a technique that enables unbiased clustering measurements from both data and simulations. This work is foundational for extracting accurate cosmological information from the clustering of galaxies. Their most cited paper (2025, 25 citations) details this methodology, while a companion study (2025, 20 citations) provides an in-depth analysis of how fiber assignment incompleteness affects two-point clustering statistics, along with mitigation strategies for DESI’s Data Release 1. With a total of 55 citations across their top papers, Lasker’s work is essential for ensuring that DESI’s measurements of baryon acoustic oscillations and redshift-space distortions are free from systematic biases. Their research directly enables the next generation of precision cosmology.