Pianist and conductor, born in Buenos Aires. Educated at Santa Cecilia Academy in Rome, he studied with his father, then with Nadia Boulanger and others. He made his debut with the Israel Philharmonic Orchestra in 1953. A noted exponent of Mozart and Beethoven, he gained his reputation as pianist/conductor with the English Chamber Orchestra. He was musical director of the Orchestre de Paris (1975--87), and musical director-designate of the new Paris Opéra at the Place de la Bastille in 1987. He became musical director of the Chicago Symphony Orchestra in 1991. In 1967 he married the cellist Jacqueline du Pré (d.1987).