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About

Hans‑Walter Rix is a leading astrophysicist renowned for his transformative work on galaxy formation, stellar populations, and the structure of the Milky Way. His research centers on understanding how galaxies evolve through hierarchical merging, with a particular focus on the faint tidal streams and substructures that reveal past accretion events. In a seminal 2010 pilot survey, Rix demonstrated that most normal spiral galaxies are surrounded by low‑surface‑brightness tidal features—direct evidence of ongoing minor mergers—garnering nearly 400 citations and reshaping our view of galaxy assembly. Beyond galactic archaeology, Rix has been instrumental in advancing large‑scale spectroscopic surveys. He is a key architect of the Sloan Digital Sky Survey‑V (SDSS‑V), the first all‑sky, multi‑epoch, optical‑to‑infrared spectroscopic survey, which is revolutionizing our ability to map stellar motions and chemical abundances across the Milky Way and beyond. With thousands of citations across his career, Rix’s work bridges observational discovery and survey innovation. His contributions have earned him international recognition, including the prestigious Karl Schwarzschild Medal, and continue to inspire a new generation of astronomers exploring the dynamic history of galaxies.