Colleen M. Johnston holds the position of Chairman at Q4, Inc. and Chairman at Unity Health Toronto. Ms. Johnston is also Member of Conseil canadien pour la diversité administrative and on the board of 7 other companies.

In her past career she was Group Head-Direct Channels, Technology & Marketing at The Toronto-Dominion Bank and Chief Financial Officer for TD Bank US Holding Co. (a subsidiary of The Toronto-Dominion Bank), Chief Financial Officer & Managing Director at The Bank of Nova Scotia and Chief Financial Officer for Scotia Capital, Inc. (a subsidiary of The Bank of Nova Scotia), Principal at Pricewaterhouse LLP, Chairman at Heart & Stroke Foundation of Ontario and Chairman of Bridgepoint Health Foundation.

Ms. Johnston received an undergraduate degree from The Schulich School of Business and an undergraduate degree from York University.