Hawtrey came from a family long associated with Eton, where he was educated himself, before coming up to Trinity in 1898. In 1901 he was 19th Wrangler; in 1903 he briefly entered the Admiralty, before going to the Treasury, where he found his vocation as an economist and remained for forty-one years. He was a very faithful Apostle, attending every annual dinner until 1954, when he was prevented from going by ill health. He was devoted to Moore, whose impassioned singing of Die Beiden Grenadiere made him realize how horrible war was for the soldiers who actually did the fighting: this constituted an epiphany for Hawtrey, and reinforced his life-long Liberalism. Moore was so much the most important influence on the life and career of Sir Ralph Hawtrey that he spent his last years working on a systematic philosophical treatise (inspired also by Robin Mayor), which was to have been a summa of his twenty-odd books and the hundreds of letters he published in The Times. He was married to the famous pianist Titi d’Aranyi.
That is from Paul Levy’s book Moore: G.E. Moore and the Cambridge Apostles. Here is more on Titi, also known as Hortense, who studied with Bartok and received numerous letters from him. And here is Scott Sumner on Hawtrey, one of the great monetary economists.