[2] Majul was born in Aparri, Cagayan, Philippine Islands, to an Ibanag mother and a Syrian Orthodox Christian father.
[3] He acquired his primary and secondary education at the De La Salle High School.
[5] He helped the future Moro revolutionary leader Nur Misuari become a lecturer at the University of the Philippines.
In 1973, Maul published his seminal work, Muslims in the Philippines, which is considered the definitive text on the subject.
[citation needed] He received the Republic Heritage Award for "the most outstanding contribution to historical writing" during the period from May 1, 1960 to April 30, 1961, as well as the First Prize in the Biography Contest on the life of Apolinario Mabini in 1964.