After his graduation as a lawyer, he began working at the office for the Armenian parliamentarian Abdallah Ishak.
[5] During the 1943 October revolt, Chader led the Kataeb and Najjadeh combine against the French forces.
The Armenian Catholic Church reached a deal with the Kataeb Party, to nominate Chader for the new reserved seat.
Chader again contested the Minorities seat, now allocated to the Beirut V – Minet El Hosn electoral district.
However he obtained strong support from the local Jewish community, which was largely sympathetic to the Kataeb Party.
[17] On March 14, 1958, in the backdrop of a national crisis in which Armenians participated on both sides, Chader was named Minister of Planning in the cabinet of Sami Solh.
[20] In the 1960 general election Chader was named as the Armenian Catholic candidate of the joint Kataeb-Armenian Revolutionary Federation (Tashnaq) 'People's List' in Beirut I electoral district.
[26] In the 1972 general election Chader was the Armenian Catholic candidate on a joint Kataeb-Tashnaq-National Liberal list in Beirut I.
[28] Chader served as Minister of State in the cabinet of Takieddine Solh between July 8, 1973 and October 31, 1974.
[1][30] As no new elections were held during the Lebanese Civil War, the Armenian Catholic parliamentary seat remained vacant until his son Antoine Chader was appointed as Member of Parliament in 1991.