Sultan Omar Ali Saifuddien III, British Resident John Barcroft, and Secretary Isa were present on behalf of Brunei.

To assure the Conference's success and validity, the High Commissioners Anthony Abell and Malcom MacDonald personally persuaded the Sultan to join.

Then from April to December 1962, he was attached to the Attorney General's Chambers in Kuala Lumpur as Deputy Public Prosecutor, Federation of Malaya.

[2] Isa was also a member of the Adat Istiadat Council and the chairman of RBA's board of directors from its founding in November 1974 to January 1984.

[9] He later became Special Adviser to His Majesty the Sultan and Yang Di-Pertuan of Brunei Darussalam in the PMO, concurrently serving as Minister of Home Affairs from 21 October 1986, until the 2005 Bruneian cabinet reshuffle on 24 May.

[19] Isa was bestowed by Sultan Hassanal Bolkiah the Manteri title of Pehin Orang Kaya Laila Setia Bakti Di-Raja on 11 May 1968,[8][20] referred to by Yang Berhormat as honorific.