Born February 24, 1922 in Toronto, Ontario
Over the course of his illustrious career Mac made an everlasting impression on the game of golf in Ontario, including:
- Owner of the original Cedar Brae Golf & Country Club
- Built the new Cedar Brae Golf & Country Club, the Parkview and Brookwood Golf Clubs, Spring Lakes Golf Club, and Vespra Hills Golf Club in 2003.
- 1966 Ontario President and Honourary Life Member of the Canadian Club Managers Association
- Life Member of Ontario and Canadian Golf Course Superintendents Association (1982 John B. Steel Distinguished Service Award
- Founding President (1994) Central Ontario Chapter of the National Golf Course Owners Association
- 1981 President of the Ontario Golf Association
- Governor (1981-1990), Honorary Governor (1991-1994), and Associate Governor (1995-2005) of the Royal Canadian Golf Association
- 1998 RCGA Distinguished Service Award.
- Founding sponsor of the Guelph Turfgrass Research and Information Centre, which is named in his honour, the G.M. Frost Building.