[6] He graduated from the Homs Military Academy[2] and served in the Syrian Army from 1956 until 1958, rising to the rank of captain before being expelled as a suspected Communist.

Beginning in 1965, he worked closely with the leadership of the Palestinian National Liberation Movement (Fatah), including Yasser Arafat.

[2] In 1967, he joined with George Habash to form the Popular Front for the Liberation of Palestine (PFLP), a Palestinian Marxist–Leninist and revolutionary socialist organization that combined Arab nationalism with the leftist ideology, and which was in conflict with Arafat.

[2] In 1968, Jibril broke away from the PFLP because of disputes over the more revolutionary Marxism advocated by Habash and Nayef Hawatmeh.

On 7 May 2001, the Israeli Navy seized a Palestinian boat filled with heavy weapons in the port of Haifa.

[8] In a 17 February 2017, Jibril did an interview with Al Mayadeen and expressed his hope that the Iranian military with others would fully back the future Palestinian war against Israel.