b. Bellaire, near Liège, 7.4.1819 d. Paris 6.5.1890
Family: Léonard's wife, the singer Antonia Sitcher de Mendi, was the cousin of Maria Malibran and Pauline Viardot.
Associates: Vieuxtemps, Mendelssohn, Charles de Bériot, Pauline Viardot, Teresa Milanollo, Camillo Sivori.
Professional appointments: Violin professor, Brussels Conservatoire, 1852-66. From 1866 taught in Paris, apart from a brief interval at the time of the war in 1870.
Pupils: Henri Marteau, Martin Marsick, César Thomson, Paul Viardot, Ovide Musin, Tividar Nachez.