Following the cessation of hostilities in Europe in 1918, Athlone was promoted to the brevet rank of colonel in June 1919, and retired from the army that November, with the honorary rank of brigadier-general. He took up posts in the civilian world, continuing at Middlesex Hospital. Because of his experience there, he was appointed in 1921 to chair an investigative committee on the needs of doctors. Known as the "Athlone Committee", its work resulted in the creation of post-graduate schools for medical education and research, such as the Royal Postgraduate Medical School at Hammersmith Hospital and the London School of Hygiene & Tropical Medicine. In March 1922, he was promoted to the rank of colonel in the Regular Army Reserves, retaining his honorary rank of brigadier-general, and, in 1937, was appointed chair of a committee of inquiry into the arrangements for "recruitment, training and registration and terms and conditions of service" for nurses.