Original: Lee worked at Institute for Advanced Study and was a professor of physics at University of Pennsylvania, SUNY at Stony Brook, University of Chicago, and head of the theoretical physics department at Fermi National Accelerator Laboratory.
Simplified: Lee worked at Institute for Advanced Study. He was a professor of physics at University of Pennsylvania, SUNY at Stony Brook, University of Chicago, and head of the theoretical physics department at Fermi National Accelerator Laboratory.