Garlick came to Malaya in 1914 and became the Medical Officer at a tin mine owned by
Guthrie & Company in the state of
Terengganu. In 1917, he became a State Medical Officer to the government of the state of
Johor. He served as the assistant to the principal medical officer of the state and in this period he was one of only three medical officers in Johor. In this capacity, he was "actively engaged in hospital and public health work in the state, as well as with the medical supervision of the gaol." He was again appointed to act as the Principal Medical Officer of the state when then vice Principal Medical Officer R. D. Fitzgerald went on four-months leave. In December 1927, Garlick was again appointed to act in this position. In June 1929, he was officially transferred to the position of Physician and Radiologist in Johor. He was again appointed to act as the Principal Medical Officer of Johor in July 1931 after Fitzgerald had left Malaya on leave. In September 1934, Garlick was officially appointed the Principal Medical Officer of Johor. He was a member of the delegation sent to represent Malaya at the Ninth Congress of the
Far Eastern Association of Tropical Medicine, held in
Nanjing, China in October. In May of the following year, Garlick received the
King George V Silver Jubilee Medal. He was appointed a member of the
Johore Council of State in February 1936. On the then Sultan of Johor's 65th birthday in September 1938, Garlick was made a . He was a member of the five-man delegation sent to represent Malaya at the Tenth Congress of the Far Eastern Association of Tropical Medicine, held in
Hanoi in November. Garlick retired as Principal Medical Officer of Johor in October 1940. After retiring, Garlick joined the British Army as a radiologist. During the
Japanese Occupation of Singapore, which lasted from 1942 to 1945, he was interned at the
Changi Prison. He wrote a book on the association, titled
Royal Singapore Tuberculosis Clinic, which was published by
Donald Moore Ltd. in January 1955. By August 1948, Garlick had become the Medical Director and the Radiologist of the newly established
Singapore Anti-Tuberculosis Association and its first clinic, the
Royal Singapore Tuberculosis Clinic, which was to open in several weeks. He went on leave to England in 1954. While on the trip, he attended the Conference of the
British Tuberculosis Association, held in
Oxford, and visited several tuberculosis hospitals both in England and
Copenhagen. In that year, Garlick's role as the association's radiologist was taken over by another radiologist, which allowed him to focus on serving as medical director. Garlick's obituary in
The BMJ wrote that the Singapore Anti-Tuberculosis Association's clinic and services "stand as a permanent memorial to his unselfish and humanitarian work" and that it was his "vision, tenacity of purpose, unremitting toil, and human interest which built up in Singapore an institution worthy of the cause it serves." ==Personal life and death==