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Gideon McFarland is a graduate student working with Tjitske Starkenburg, Katrin Heitmann, and Salman Habib on Large-Scale Structure cosmology. In particular, Gideon studies the cosmic extremes of the density field: cosmic voids and massive galaxy clusters. He is interested in calculating void statistics, such as the void size function, using data from the Rubin Observatory. He also uses large hydrodynamical cosmological simulations to probe the properties of the most massive galaxies that sit at the center of clusters. Gideon is an active member of the Dark Energy Science Collaboration and works closely with staff scientists at Argonne National Laboratory and researchers at the SkAI Institute.