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About

Hee-Jong Seo is a leading cosmologist whose work is central to understanding dark energy through the largest-ever 3D map of the universe. As a key member of the Dark Energy Spectroscopic Instrument (DESI) collaboration, Seo’s research focuses on baryon acoustic oscillations (BAOs)—a standard ruler for cosmic distances—and the complex data challenges of massive spectroscopic surveys. Her major contributions include co-authoring the first detection of the BAO signal from early DESI data (37 citations), a landmark result that validates the instrument’s power to probe cosmic expansion. She also led critical work on the DESI fiber system (57 citations) and developed novel methods to correct for fiber assignment biases in clustering measurements (25 citations), ensuring unbiased cosmological constraints from the survey’s 40 million galaxy spectra. Her astrometric calibration of DESI’s 5,020 robotic fiber positioners (4 citations) underpins the instrument’s precision. With over 130 cumulative citations across these foundational papers, Seo’s technical and analytical innovations are enabling the most precise measurements of dark energy to date, making her a pivotal figure in the next generation of cosmological discovery.