J.L. Granatstein writes on Canadian national history, and he has published extensively on politics, defence, foreign policy and military history.
He taught Canadian history at York University for thirty years. After taking early retirement in 1995, he is now Distinguished Research Professor of History Emeritus.
His best-known work is Who Killed Canadian History?, but he is the author of over sixty other books, including Yankee Go Home? and Victory 1945.
Granatstein was Director and CEO of the Canadian War Museum from 1998 to 2000, is a Trustee of the Canadian Museum of Civilization Corporation, was chair of the Council for Canadian Security in the 21st Century and is Chair of the Advisory Council of the Canadian Defence and Foreign Affairs Institute. He is an Officer of the Order of Canada and has six honorary degrees.