David Herbert Donald (1920–2009) was an American historian and the author of many books on the Civil War era, including Lincoln (1995), a New York Times bestseller widely regarded as the definitive biography of the US president. Donald twice won the Pulitzer Prize, for Charles Sumner and the Coming of the Civil War (1960) and Look Homeward: A Life of Thomas Wolfe (1987), and served as the Charles Warren Professor of American History at Harvard University. His other notable works include the influential essay collection Lincoln Reconsidered (1956); Charles Sumner and the Rights of Man (1970), the second volume in his acclaimed biography of the antislavery statesman; and Liberty and Union (1978), a comprehensive analysis of the American scene from 1845 to 1890.