Herbert Hope Risley
Sir Herbert Hope Risley (4 January 1851 – 30 September 1911) was a British ethnographer and colonial administrator, a member of the Indian Civil Service who conducted extensive studies on the tribes and castes of the Bengal Presidency. He is notable for the formal identification of the centuries old established caste system of the entire Hindu population of British India in the 1901 census, of which he was in charge.