Don began his investment career with A.E. Ames and Company in 1980, which merged into Dominion Securities in 1982 and later became RBC Dominion Securities. During his 14 years at RBC, Don rose to the position of Senior Vice President, served as a member of the Chairman's Council for 11 years and sat on the Investment Advisor Council. Don left RBC in 1996 to join Gordon Private Client Corporation, a subsidiary of Gordon Capital Corporation, where he was Managing Director. When the firm was acquired by HSBC Securities Canada, Don remained at the newly amalgamated company until he co-founded McFarlane Gordon Inc.