[2][3] In 1874, St. Clair was appointed the headmaster of the Moulmein Town School in Myanmar.
[1] In 1909, he represented British Malaya at the Imperial Press Conference in London.
[2] By 1916, he had achieved the rank of major and was the commanding officer of the Singapore Voluntary Artillery.
[5] He also arranged the Burmese song Kaya Than for military bands.
The arrangement became the Burmese National Anthem in 1886 during the British occupation of Upper Burma.