Berry began his coaching career in 1966 as head varsity basketball coach at Highlands High School of North Highlands, California and stayed as coach until 1969. After completing his master's degree at Michigan State, Berry became head coach at Cosumnes River Junior College from 1970 to 1972. Then, Berry became an assistant coach at the NCAA Division I level with California until 1977. Berry then returned to his alma mater Michigan State to be an assistant coach under Jud Heathcote and was part of the coaching staff of the 1979 NCAA championship team that featured Magic Johnson. From 1979 to 1989, Berry was the head men's basketball coach at San Jose State. For the San Jose State Spartans, Berry had a 142–144 record, then the Spartans' second-highest win total under one coach. Under Berry, San Jose State had a 17–12 record in the 1979–80 season, won the 1980 PCAA tournament, and made the 1980 NCAA tournament. In a 21-9 season in 1980–81, San Jose State qualified for the 1981 National Invitation Tournament. San Jose State also had three straight seasons over.500 from 1984 to 1987. However, the 1988–89 Spartans finished 5-23. In January 1989, when the team was 5-11, 10 of the 14 players on the Spartans men's basketball team accused Berry of "mental cruelty" and refused to play or practice under Berry as coach. However, the players declined to provide specific examples. Berry then organized a new team of walk-on athletes, including star football playerJohnny Johnson. San Jose State dismissed Berry after the season on March 24, 1989. After San Jose State, Berry entered the NBA as a scout and assistant coach for the Sacramento Kings in 1989. He transferred to the Houston Rockets as a scout in 1991 and then assistant coach in February 1992 under Rudy Tomjanovich. Berry was an assistant coach to the Rockets 1994 and 1995 championship teams. From 1999 to 2003, Berry was an assistant coach for the Chicago Bulls Berry was an assistant under Tim Floyd until Floyd resigned on Christmas Eve of 2001, when the Bulls named Berry as interim head coach. Berry coached two games, both losses, and Bill Cartwright became permanent head coach effective December 28. On September 7, 2006, the Washington Wizards announced that Bill Berry would join the team as an assistant coach to head coach Eddie Jordan.
Personal life
Bill Berry has been married to Clarice "Reese" Berry since 1963 and had two children. The Berry family lived in Morgan Hill, California during Bill Berry's tenure at San Jose State. Their son Ricky Berry played college basketball at San Jose State under Bill Berry and in the NBA for the Sacramento Kings before committing suicide in 1989.