In 1928, he began serving in Sarawak and then became a district officer in 1938, and would later signed up for military service from 1942 until 1946, during the World War II.

[9] In January 1957, Gilbert had to be flown to Seria twice in order assist the Brunei Police Force in diffusing the ongoing strike carried out by British Malayan Petroleum (BSP) Chinese workers imported from Hong Kong.

[10] During a discussion together with the Brunei Legislative Council, he affirmed that Gadong was exclusively for the Kampong Ayer residents, whom like to relocate to a new area.

[12] On 15 February 1958, he gifted three books to the public, which were; Skin and Bones, Storm and Echo and The Foolish Gentlewomen, which was well received.

[14] Gilbert would be succeeded by Dennis White later that year, and thus he gave a farewell speech to the people of Brunei in hopes of returning to the country in the future.