 He served as the Inspector-General of police of Madras from 1894 to 1906 when he was appointed Chief Secretary to the Madras government.In 1908, Hammick was appointed to the Executive Council of the Governor of Madras and served from 1908 to March 1912, when he was chosen to act as the Governor of Madras until the arrival of the governor-designate John Sinclair, 1st Baron Pentland in October 1912.Hammick acted as the Governor of Madras from 30 March 1912 to 30 October 1912.