1930- . French socialist politician, prime minister from 1988. A former radical, he joined the Socialist Party (PS) 1973, emerging as leader of its moderate social-democratic wing. He held ministerial office under Mitterrand 1981-85. Rocard trained at the prestigious Ecole National d'Administration, where he was a classmate of Jacques Chirac. He became leader of the radical Unified Socialist Party (PSU) 1967, standing as its presidential candidate 1969. Having gone over to the PS, Rocard unsuccessfully challenged Francois Mitterand for the party's presidential nomination 1981. After serving as minister of planning and regional development 1981-83 and of agriculture 1983-85, he resigned Apr 1985 in opposition to the government's introduction of proportional representation. In May 1988, however, as part of a strategy termed `opening to the centre', the popular Rocard was appointed prime minister by Mitterrand.