David Irving is a British author and historian known for his controversial views on World War II and the Holocaust. He gained notoriety for his books that challenge the accepted narratives of these historical events, particularly regarding Adolf Hitler and the Nazi regime. His work has sparked significant debate and criticism from historians and scholars. Irving's views have led to legal battles and accusations of Holocaust denial, which is the rejection of the established facts about the Holocaust. In 2000, he lost a libel case against historian Deborah Lipstadt, who accused him of being a Holocaust denier, resulting in a court ruling that labeled him as an unreliable historian.