About David Gagan David Gagan is a professor emeritus of History at Simon Fraser University. Books by David Gagan Hopeful Travellers Families, Land, and Social Change in Mid-Victorian Peel County, Canada West by (author) David Gagan Hopeful Travellers Families, Land, and Social Change in Mid-Victorian Peel County, Canada West by (author) David Gagan The Denison Family of Toronto 1792-1925 by (author) David Gagan The Denison Family of Toronto 1792-1925 by (author) David Gagan