Michael William Krzyzewski ( shih-ZHEF-skee; nicknamed "Coach K"; born February 13, 1947) is an American former college basketball coach. He served as the head coach at Duke University from 1980 to 2022, during which he led the Blue Devils to five national titles, 13 Final Fours, 15 ACC tournament championships, and 13 ACC regular season titles. Among men's college basketball coaches, only UCLA's John Wooden has won more NCAA championships, with a total of ten. Krzyzewski is widely regarded as one of the greatest college basketball coaches of all time.Krzyzewski has also coached the United States national team, which he has led to three gold medals at the 2008, 2012, and 2016 Olympics. He was the head coach of the U.S. team that won gold medals at the 2010 and the 2014 FIBA World Cup, and an assistant coach for the "Dream Team" at the 1992 Olympics.