[4] He was elected chairman of the Hong Kong General Chamber of Commerce in 1864.
[5] Gibb was appointed a member of the Legislative Council of Hong Kong in 1866 during the absence of Thomas Sutherland.
[7] He was appointed again to the Legislative Council in 1879 on the resignation of Henry Lowcock.
[8] He was replaced by Ng Choy in 1880,[9] the latter becoming the first Chinese member of the Legislative Council on his appointment.
In November 1881, Gibb was admitted to the Manor House lunatic asylum in Chiswick, where he died the following spring.