Cable studied Economics at Cambridge and Glasgow, before working as an economic adviser to the Government of Kenya in the 1960s, and for the Commonwealth Secretariat in the 1970s and 1980s. During this period, he also lectured in economics at Glasgow. He later served as Chief Economist for Shell in the 1990s. Initially active in the Labour Party, Cable became a Labour councillor in Glasgow in the 1970s, during which time he also served as a special adviser to then-Trade Secretary John Smith. In 1982, however, he defected to the newly formed Social Democratic Party, which later amalgamated with the Liberal Party to form the Liberal Democrats.