1. From 1894 he served as Principal Medical Officer to the Cape Government. 2. In the First World War he served in Mesopotamia as the Principal Medical Officer . 3. He was promoted to Principal Medical Officer . 4. He became principal medical officer of the submarine base RN Hospital Haslar later that year. 5. By then he was promoted to the rank of Principal Medical Officer of the First Class. 6. He was appointed Principal Medical Officer at headquarters in India and Director of Medical Services in India. 7. He was Surgical Specialist since 1974 and Regional Health Director and Principal Medical Officer , Ministry of Health. 8. In 1908, he was appointed Principal Medical Officer to the Lowland Division of the Scottish Territorial Forces. 9. Dr Thomas Tsang Ho-fai, principal medical officer with the Department of Health, said on Wednesday: 10. Concurrently he worked direct for the Department of Health in Scotland rising to be Principal Medical Officer to Scotland.