Donald L. Caldwell has been researching World War II for more than thirty years. His latest book, Thunder on Bataan: The First American Tank Battles of World War II (Stackpole, 2019) is the story of a little-known armor unit that was surrendered on Bataan in the early days of World War II. He has written widely on the German Luftwaffe. His first book, JG 26: Top Guns of the Luftwaffe (Crown, 1991) sold 70,000 copies across all editions, and the two volumes of his JG 26 War Diary (Grub Street, 1996, 1998) are considered the best English-language history of a German fighter unit. The Luftwaffe over Germany: Defense of the Reich (Greenhill, 2007) (co-authored with Richard Muller) was given the Best Air Power History Book Award for 2008 by the Air Force Historical Foundation. A retired research chemist, Caldwell lives near Houston, Texas.