Mike Krzyzewski, byname of Michael William Krzyzewski, also called Coach K, (born February 13, 1947, Chicago, Illinois, U.S.), American college basketball coach who amassed the most coaching victories in National Collegiate Athletic Association (NCAA) Division I men’s basketball history while leading the Duke University Blue Devils to five national championships (1991, 1992, 2001, 2010, and 2015) and 13 Final Four (championship semifinals) berths. As a high-school basketball player, Krzyzewski led Chicago’s Catholic League in scoring for two years. He played collegiately at the United States Military Academy (Army) under legendary coach Bob Knight. He coached service teams and the U.S.