In addition to being a lawyer, Kassar is a businessman, dealing finance investments. He has founded and owns various companies concerning trade, shipping and travel, and industry and chairman of Kassar Group. He is also shareholder with Walid Jumblatt in a cement manufacturing firm.[1] Kassar served as the president of the Beirut Chamber of Commerce and Industry for nearly thirty years; to which he was elected in January 1972.[5][6] In June 1997, he became the president of the Federation of Chambers of Commerce, Industry and Agriculture in Lebanon.[6] From 1999 to 2000, he headed the International Chamber of Commerce (ICC) based in Paris.[5] On 1 January 2001, Richard McCormick, who served as his deputy at the ICC, succeeded Kassar as head of the ICC.[7]