In a retrospective focused on Chen Ning Yang, Member (1949–54) and Professor (1955–66) in the School of Mathematics/Natural Sciences, who passed away in 2025, Stephen L. Adler, Professor Emeritus in the School of Natural Sciences, traces Yang’s life and landmark work—from Ising magnetization and the Lee–Yang theorem to parity violation and Yang–Mills theory—highlighting ideas that shaped today’s Standard Model.