David Herbert Donald was an American historian and biographer, best known for his work on the life of Abraham Lincoln. Born on October 1, 1920, he became a prominent figure in the field of American history, focusing on the Civil War era and its key figures. His scholarship earned him recognition and several prestigious awards. Donald authored several influential books, including Lincoln and Lincoln Reconsidered, which provided new insights into the 16th President's life and leadership. He served as a professor at various institutions, including Harvard University and Boston University, contributing significantly to the understanding of American history through his research and writings.