Raoul H. Bott (1923-2005) is a mathematician born in Budapest who spended his life in Canada and US after WWII. He is famous for the Bott periodicity theorem. The theorem is foundamental in K-theory and the original proof was using Bott-Morse functions. Bott is also known for the Atiyah-Bott-Weil theorem in the representation theory of Lie groups.
Bott received the Wolf prize in 2000. His students include Stephen Smale, Daniel Quillen, Peter Landweber and Robert MacPherson.