Dennis E. Showalter was an American military historian who specialized in German military history, particularly during the World War I and World War II eras. He was born on October 8, 1942, and passed away on December 30, 2019. Showalter was known for his expertise on the German Army, and he wrote extensively on military tactics, strategy, and the sociopolitical aspects of warfare. He was a professor of history at Colorado College for many years, where he influenced many students with his passion for military history and pedagogy. Some of his notable works include "Tannenberg: Clash of Empires" and "Hitler's Panzers: The Lightning Attacks that Revolutionized Warfare," which reflect his deep research and nuanced understanding of military conflicts. Showalter was also a former president of the Society for Military History and received recognition for his contributions to the field, including the Pritzker Military Museum & Library Literature Award for Lifetime Achievement in Military Writing.