From 1935 to 1944, Cochrane was chief medical officer at the Lady Willingdon Leprosarium in Chingleput, Madras. He became adviser in leprosy to the State of Madras, and later worked in the General Hospital, Madras, as well as Vellore Christian Medical College and Hospital, where he was instrumental in obtaining support to upgrade the institution. In 1945, Cochrane began studies with sulfone derivatives, and was the first to use dapsone in the treatment of leprosy, laying the groundwork for treatments still used today. (https://leprosyhistory.org/database/person4)