Mack applied as a reserve officer while he was working at a W. T. Grant variety store. When he was hired on December 1, 1974 by then-chief Edwin Wood, he became the first African American to serve on the department. He retired on October 31, 2006. In 2011 he began working for the Homewood Municipal Court as a bailiff.
Mack died of complications from cancer in May 2019.