John Lewis Gaddis, deemed the “Dean of Cold War Historians” by a New York Times reviewer, has published yet another book, at least the 14th in a long and productive career. The latest, On Grand Strategy, however, will disappoint those hoping for another learned exposition on the American role in the post–World War II era. Rather, Gaddis, the Robert A. Lovett Professor of Military and Naval History and Director of the Brady Johnson Program in Grand Strategy at Yale University, has written a wide-ranging essay on strategic thinking that begins with the dawn of recorded history and concludes with the momentous challenges facing American leaders during World War II. As such, On Grand Strategy will bring joy to those whose professions depend on strategizing and anyone wanting to rummage through history seeking insights into how past strategists practiced their craft.