Colin Gillespie, an Australian Canadian physicist, is the author of the books This Changes Everything; Time One: Discover How the Universe Began; and Portrait of a People: A Study in Survival, as well as dozens of scientific research publications in physics, biophysics, neurophysiology, and radiation biology.

He is also a lawyer and strategic analyst for business and aboriginal clients, and has written about social planning, class actions, aboriginal law, environment management, and indigenous constitutions.

He is an avid traveler, having spent time in more than fifty countries and all seven continents.