Don is the author of Under Siege: Religious Freedom and the Church in Canada at 150 (1867–2017). An alumni of Queen's University in Kingston and the University of British Columbia Faculty of Law, Don has been a member of the Law Society of Upper Canada since 1990. Not coincidentally, he is also a long time member and former board chair of Canada's Christian Legal Fellowship.
In addition to seven appearances before the Supreme Court of Canada, multiple appearances before committees of Parliament and the Ontario Legislative Assembly, Don is an avid motorcyclist who is vice-chair of the Society of Ottawa Area Riders and has been featured in motorcycle safety videos and media interviews. He has served on the boards of several local and national charities.
Regularly featured in print, television, radio and social media, Don is a recipient of the Queen Elizabeth II Diamond Jubilee Medal. He served for 7½ years as Vice-President, General Legal Counsel with The Evangelical Fellowship of Canada and Director of the EFC's Centre for Faith and Public Life.