Herbert Gush (1929-2025) was a Canadian astrophysicist at the University of British Columbia. He pioneered the techniques of radio interferometry, but is best known for his definitive evidence that the cosmic microwave background has a precise thermal spectrum. This demonstrated that the universe was in good thermal equilibrium when it was only 10 days old.
Reference: WGSBN Bulletin, Volume 6, Number 15, page 14
