Born in March 1870, son of the Rev David Evans of Pont Dolanog, Montgomeryshire, he was educated at Christ's College, Brecon, and later at Oxford as a non-collegiate student. Later he entered St George's Hospital with a university scholarship, and gained numerous prizes. He was awarded the Jacksonian Prize in 1913 for an essay on malformations of the small intestine, and in 1923 a special certificate and "proxime accessit" for an essay on malignant disease of the testicle. In 1921 he was Arris and Gale Lecturer, speaking on the azygos veins and their relationship to surgery. He was Hunterian Professor in 1907, 1915 and 1927, and was an examiner in surgery for the University of Oxford. His principal appointment was as surgeon and lecturer in surgery to the Prince of Wales General Hospital, and he was also surgeon to the Cancer Hospital and consulting surgeon to the Wimbledon and Walton Hospitals. He maintained his contact with Montgomeryshire throughout his life, and was consultant to the Montgomery County Infirmary and to the Welsh National Health Board. He served as High Sheriff of the County, and President of the Montgomeryshire Society. He was a Vice-President of the Medico-Legal Society, President of the Westminster Division of the BMA in 1913-14, and Master of the Worshipful Company of Barbers in 1944. Evans served in the South African War as civil surgeon to Wellington Barracks, and in the war of 1914-18 was awarded the Mons Star. In 1939 he joined the Home Guard and served throughout the war. He collected medical engravings, among which portraits of the Hunter brothers formed a conspicuous part; these were acquired by the Osler Library of McGill University, Montreal after his death. An eminent Freemason he was awarded the Order of Service to Masonry, a rare distinction. He died on 11 October 1962 in his ninety-third year and a memorial service was held in Chelsea Old Church on 15 November 1962.