Professor Gary Sheffield is the foremost authority on World War I and a bestselling author in the UK who has been published worldwide. He frequently leads parties to historic battlefields in the Western Front and Gallipoli, and the World War II battlefields of France and Italy. His books include Forgotten Victory: The First World War - Myths and Realities (2001), The Somme (2003), and Douglas Haig: War Diaries and Letters 1914-18 (2005), edited with John Bourne.