William Henry Slack
- Bats Left, Throws Right
- Height 5' 10", Weight 175 lbs.
Bill Slack pitched in the minors from 1952 to 1966. Other than 1959, he spent his career in the Boston Red Sox chain.
Slack also managed in the Red Sox chain for 17 years between 1961 and 1984, 12 1/2 of those in Winston-Salem, NC. In 1961 Slack got his start with the Red Sox, taking over the Waterloo Hawks in midyear for Matt Sczesny who was moving up to Winston-Salem. In 1962 he managed the Pocatello Chiefs in the Pioneer League. In 1963, Slack started the year with the Wellsville Red Sox, but was swapped with Sczesny and finished the year with the Winston-Salem Red Sox, where he would stay through 1968. The 1964 and 1966 clubs had the best record in the Carolina League with the '64 team winning the title. In 1969 Slack was moved down to the Greenville Red Sox in the Western Carolinas League, but he was back in Winston-Salem in 1970. After not managing for two years, Slack managed Winston-Salem again in 1973-1974. He managed the Bristol Red Sox in 1975, replacing Dick McAuliffe in midyear and leading the team to the league title, then took another two year hiatus from managing. Slack managed Winston-Salem in 1978-1979, winning the league title in 1979, took another three years off from managing, then managed Winston-Salem yet again in 1983 and in 1984, when they were re-christened the Winston-Salem Spirits.
Slack then became a pitching coach in the Atlanta Braves' chain with the Greenville Braves in 1985-1986, Durham Bulls in 1987, Greenville again in 1988-1993, Durham in 1994, Greenville in 1996, and Durham in 1997.
Slack returned to managing briefly in 2001, managing the Savannah Sand Gnats, a Texas Rangers affiliate in the South Atlantic League, until being replaced by Pedro Lopez in mid-year. He then was a coach for the Wilmington Blue Rocks in 2002-2003.
Slack won 5 league titles in his career, 4 of them in Winston-Salem.