Pengiran Mohammad played a significant role in documenting Brunei's history, particularly in tracing key events before and after the Second World War.

Determined to overcome this challenge, he taught himself English, eventually mastering it to a level unmatched by his Malay peers in Brunei, both in writing and speaking.

[3] In April 1926, after the recall of L. R. Watts to Singapore, Pengiran Mohammad assumed the role of acting officer in charge of the Wireless Department.

[9] During the Japanese occupation of Brunei from 1941 to 1945, Pengiran Mohammad continued to serve as the state wireless officer, maintaining his role under the new regime despite the expulsion of foreign workers.

A planned escape led the family to flee into the jungle, where they hid until the Japanese left, with neighbours falsely reporting his death to mislead their captors.

Months later, he received exciting news: he had been selected to travel to London as part of the 1946 Victory celebrations, in recognition of his contributions during the Japanese occupation.

[13] British Resident Eric Ernest Falk Pretty attempted to dissuade Pengiran Mohammad from aiding his nephew, A. M. Azahari, in returning to Brunei, claiming that President Sukarno had negatively influenced him.

Despite this, Pengiran Mohammad ultimately assisted in transporting Azahari after his secret arrival in Labuan, where he first reunited with his father before reaching Brunei in October 1952.

Before the conference, he attended the opening of the Second Legislative Council Meeting in Singapore, and after its conclusion, he continued to Kuching for the regatta in the second week of September.

[23] In April, he and one other traveled to Formosa to attend the opening of the Taipei Grand Mosque, aiming to strengthen ties between Brunei and the Muslims in China.

[24] On 23 July 1961, he formally inaugurated the Kampong Menengah Malay School in Lamunin, accompanied by key figures such as Othman Bidin and several officials from the Department of Information and Radio.

[27] He was also unanimously reappointed as chairman of the Brunei Town Football Association during its annual general meeting, held on 25 October at the Dewan Kemasharakatan conference room.

[33] Following the Brunei revolt in December, Pengiran Mohammad, alongside other high-ranking officials, reaffirmed their unwavering loyalty to the sultan.

They pledged to sacrifice everything to combat treason and strongly condemned the rebellion led by Azahari, rejecting his false claims that the uprising had the support of the Bruneian people.

[2] On 16 April 1967, he travelled to Kuala Lumpur with Pengiran Muda Hashim to represent the sultan and the Brunei government at the funeral of Tuanku Munawir, the Yang di-Pertuan Besar of Negeri Sembilan.

[47] Later, on 19 August, he was appointed by the sultan as a personal representative to greet and bid farewell to Singaporean Prime Minister Lee Kuan Yew during his visit to Brunei for the royal wedding of Princess Nor'ain and Pengiran Anak Mohammad Yusof.

[51] In early July 1970, Pengiran Mohammad accompanied the royal wedding of Prince Mohamed Bolkiah, held at Omar Ali Saifuddien Mosque in Brunei Town, where the marriage was officiated by Zain Serudin.

[57] Pengiran Mohammad, a keen admirer of Western fashion and modernity, often sported the latest outfits from London catalogues and drove a Vauxhall.

His final promotion came in the form of the wazir title Pengiran Temenggong Sahibul Bahar,[c] which was conferred at the Lapau on 20 October 1971,[62][63] and styled as Yang Teramat Mulia Seri Paduka.