David Mumford is a retired math professor who taught for more than 40 years first at Harvard University and then at Brown University. He is a recipient of a MacArthur Grant, a Fields Medal, the Shaw and Wolf Prizes. He is a past President of the International Mathematical Union. He has worked extensively in both pure and applied mathematics, in algebraic geometry and computer vision and is the author of numerous books including "Indra's Pearls" for the general public.