Major Sir William Newenham Montague Orpen , KBE , RA , RHA ( 27 November 1878 - 29 September 1931 ) was an Irish portrait painter , who worked mainly in London .
Sir William Newenham Montague Orpen KBE RA ( 27 November 1878 - 29 September 1931 ) was an Irish portrait painter , who worked mainly in London .