He received his bachelor's degree in June 1922 and a month later married Lena Jones, who gave birth to a daughter in September of the same year.
[6] He also sold valuable historical artefacts that he had brought back from Siam, especially figures of the Buddha and Hindu deities, the oldest of which were from the Dvaravati and Srivijaya eras.
His thesis, supervised by Charles Otto Blagden, dealt with the origin and history of the Hindu and Buddhist ceremonies of the royal court of Siam.
He returned to Siam for field research in 1930-31 and observed, among other things, the Giant Swing ceremony (Sao Ching Cha) at Bangkok's Wat Suthat temple.
[11] On behalf of the Greater India Research Committee, Quaritch Wales led archaeological excavations of early Buddhist sites in Thailand from 1934 to 1936.
This work formed the basis of his book The Making of Greater India,[12] published in 1951, in which he further developed George Cœdès' theory of the "Indianisation" of Southeast Asia.
During the Second World War, Quaritch Wales served from November 1940 as a second lieutenant (later promoted to captain) and intelligence officer in the 11th Indian Infantry Division, which fought against the Japanese in British Malaya.