Source: Hon. M. D. Irving Gass, C.M.G., Colonial Secretary in Hong Kong by R. White, vintage silver print, 16.8 x 12 cm, 1967.

Michael D. I. Gass was the Acting Governor of Hong Kong during the Hong Kong riots in 1967 and the mastermind behind the crackdown on the riots. Born in 1916, he was educated in a famous public school and later graduated from both Cambridge University and Oxford University. He began his career in the Colonial Administrative Service, and later joined the army during WWII. After the war, he returned to his diplomatic work and was posted to various places across Africa and the Pacific until his retirement in 1973.