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Benjamin V. Rackham is a leading figure in the search for temperate, Earth-sized exoplanets, specializing in the detection and atmospheric characterization of planets orbiting ultracool dwarf stars. As a key architect of the SPECULOOS (Search for habitable Planets EClipsing ULtra-cOOl Stars) project, Rackham has driven the development of a dedicated transit survey targeting the nearest and smallest stars—those under 3000K and within 40 parsecs. His work is foundational to the field, with his most cited paper (105 citations) outlining the SPECULOOS strategy to find planets uniquely suited for detailed study by next-generation observatories like the James Webb Space Telescope. Rackham’s global analysis of the TRAPPIST survey (19 citations) provided critical occurrence rate estimates for close-in planets, directly informing the design of SPECULOOS. His contributions extend from defining target lists and survey strategies to leading the project’s five-year hunt for terrestrial worlds. By focusing on ultracool dwarfs—the most promising laboratories for atmospheric characterization—Rackham’s research is paving the way for humanity’s first detailed look at potentially habitable exoplanets, making him a pivotal figure in the quest to understand our place in the cosmos.