Physicist Steven Weinberg, who was born in 1933, died on July 23, 2021.
He was arguably the dominant figure in theoretical particle physics during its period of great success from the late sixties to the early eighties. In particular, his 1967 work on unification of the weak and electromagnetic interactions was a huge breakthrough, and remains to this day at the center of the Standard Model, our best understanding of fundamental physics.
From Not Even Wrong.
Science News has another nice obituary for him.