Don began his career as a math teacher at Emery CI in Toronto. After many years of teaching student teachers at the University of Toronto, Don retired as a Professor Emeritus at OISE/U of T. While at the University of Toronto Don returned to the classroom for a full year several times. This paradoxically “re-energized him and wore him out”. Since “retiring” Don has done many workshops and keynotes across Canada, USA, and New Zealand.
Publications have included Mathemagic and Taking the Numb Out of Numbers, both available on Amazon.com for about one cent!
For three successive years, a highlight for Don was writing a different Blue Jays’ Math Book which was given out to the first 20 000 spectators at a Blue Jays’ game… This was in an age before bobble head dolls!