Seymour Parter died on October 21, 2022.
He got his Ph.D. from Courant Institute in 1957 after spending several years working on early computers at Los Alamos. He had a joint appointment in both the mathematics and computer science departments from 1963 to 1996. He continued to be involved in the department’s probability seminar and even in topics courses for a number of years after retirement.
Link: https://www.legacy.com/us/obituaries/madison/name/seymour-parter-obituary?id=36884256