A Michigan native, Mark Tetreault studied with Wes Jacobs of the Detroit Symphony Orchestra, and then continued his work at the New England Conservatory of Music in Boston with Thompson Hanks. While in Boston, Mark was an active free-lance performer, playing with the New Hampshire Philharmonic, the Portland Symphony, the Boston Civic Symphony, the Cantabrigia Brass Quintet, the Fellowship Orchestra of the Berkshire Music Festival at Tanglewood and the Spoleto Festival Orchestra. After graduation, Mr. Tetreault joined the Jacksonville (Florida) Symphony Orchestra, where he worked until coming to Toronto in 1986.
Mark is Director of Symphonic Services for the Canadian Office of the American Federation of Musicians. Working from the Toronto Office, Mark provides service to AFM Locals and orchestras from Halifax, Nova Scotia to Victoria, British Columbia. His duties include negotiation of collective agreements, assistance in dispute resolutions, representation at industry and union conferences and seminars, assistance to AFM Locals, and maintaining resources of information for bargaining and of best orchestral practices.

Mark was a founding delegate of the Regional Orchestra Players Association and has served as a Director and later as Secretary of the Toronto Musicians' Association, AFM Local 149.

Mark is married to violinist Leslie Dawn Knowles, who is the fiddler in the Ontario-based band Hometown Bluegrass, as well as being a long-tenured member of the Toronto Symphony 1st violin section. Together they have a large family of beautiful, bright and talented children and cuddly cats.

In his free time, Mark enjoys skiing, hiking and playing with his kids.