The Professional Activities series documents Mack's professional and civic endeavors, and his interest in education, job training, and counseling services for minorities. Records include collected publications and programs, essays (some written by Mack's family members), and curriculum materials from the Wayne County Attention Centers where Mack served as an Administrative Coordinator.
Of particular note is correspondence from notable Michigan leaders and institutions: governors William Milliken, Jim Blanchard, and John Engler, state Senator Carl Levin, Congressman John Conyers, Detroit Mayor Coleman A. Young, among other state and Detroit city officials. Also included is correspondence from the Area Manpower Institute for the Development of Staff, the W. K. Kellogg Foundation, the KOOL Achiever Awards program, the Comprehensive Youth Training and Community Involvement Programs Advisory Board (via New Detroit, Inc.), and the National Center for Careers in Public Life. Mack's correspondence pertains mostly to such topics as land use and zoning laws for industrial or commercial purposes, Proposition A and the 1973 millage, House Bill 5743 (ca. 1976) regarding the revised school code, job training programs, the 50/50 Education Partnership school finance plan, letters of recommendation on Mack's behalf, congratulatory letters regarding his elections to the Detroit School Board, letters thanking him for his services, and other noteworthy correspondence pertaining to accolades he has received.