Henry S. Warren Jr.

Henry S. (Hank) Warren, Jr.,
an American computer scientist and IBM research fellow, best known as author of Hacker's Delight, a groundbreaking book on all the programming tricks and bit-twiddling, which also influenced chess programming, especially in manipulating bitboards. Hank received his Ph.D. in computer science from the Courant Institute at New York University. Since 1973 he has been with IBM's Research Division, focusing on compilers and computer architectures.