Aridi is a physics teacher by education and worked in a high school in Aley before dealing with politics.[3] In 1972, he joined the Progressive Socialist Party (PSP) headed by Walid Jumblatt.[4] In 1980, he began to serve as a special envoy of the Lebanese National Movement (LNM). He became assistant secretary of the PSP in 1983.[4] He was sent to Algeria where he remained during the Israeli invasion of Lebanon.[3] In 1991, Aridi began to serve as political advisor of Walid Jumblatt.[3] He returned to Lebanon in 1983 and launched a radio station, the Sawt al Jabal (Voice of the Mountain) that was the broadcast radio station of the PSP.[3] He worked as its director until 1994 when it was closed.[3]