David M. Glantz and Jonathan M. House have collaborated on all five volumes of the Stalingrad Trilogy, as well as on the books When Titans Clashed: How the Red Army Stopped Hitler and The Battle of Kursk. A retired U. S. Army colonel fluent in Russian, Glantz is the author of numerous books, including The Battle for Leningrad, 1941-1944; Colossus Reborn: The Red Army at War, and Red Storm over the Balkans: The Failed Soviet Invasion of Romania. Professor emeritus of Military History, US Army Command and General Staff College, House is the author of Combined Arms Warfare in the Twentieth Century.