Born in Seoul, Leo An graduated from National University of South Korea and perfected his studies at Conservatorio Giuseppe Verdi in Milan. Today he is professor at Anyang University in Korea. His signature Verdi role is Rigoletto that he played in Verona, Florence, Lisbon, Bregenz, Bratislava, Prague, Daegu and Milan. He was Nabucco at Washington Opera, sung Gerard in Andrea Chénier, Tonio in I Pagliacci, Lescaut in Manon Lescaut, the title role in Simon Boccanegra (with Myung-Whun Chung conducting) and Escamillo in Carmen, Scarpia in Tosca and Germont in La Traviata. He sang Falstaff at Seoul's National Opera House and in Slovak National Theatre. He was praised as Sharpless in Madama Butterfly at Daegu Opera House (South Korea) and Ping in Turandot in Brescia, Bergamo, Cremona, Pavia und Como. Furthermore, his roles include Marcello in La Bohème, the lead role of Torquato Tasso, Luna in Il Trovatore, Ezio in Attila, Renato in Un ballo in maschera, Amonasro in Aida, Valentin in Faust, the title role in Rossini's Guglielmo Tell, Alfio in Cavalleria Rusticana und Francesco Foscari in I Due Foscari.