Sir William ORPEN, painter born Stillorgan, Dublin 1878 died 1931, lived at 8 South Bolton Gardens, London SW5 (Studied art at the Metropolitan School and at the Slade School) an official war artist with an astonishing portfolio of powerful work.
His paintings and drawings say more than I can, and urge a visit to: http://commons.wikimedia.org/wiki/Category:William_Orpen
William Orpen, The signing of peace in the Hall of Mirrors at Versailles, 28 June 1919.
Ready to Start. Self-Portrait, 6 octobre 1917.Both pictures courtesy of the Imperial War Museum, London via Wikimedia commons