Hiroki Kasai, viola, has been performing extensively on violin and viola across Europe, Asia, Australia, and the United States. He has performed in such prestigious venues as the Elbphilharmonie, Carnegie Hall, Suntory Hall, Lincoln Center, and Barbican Center and at prominent music festivals such as the Beethovenfest Bonn, Pacific, Pablo Casals, Schleswig-Holstein, and Gstaad Menuhin Festivals. Kasai graduated from the Royal Academy of Music in 2021, studying under the tutelage of Rodney Friend. He continued his studies on the violin at the International Menuhin Music Academy. Beginning in 2023, he studied viola at the Escuela Superior de Musica Reina Sofia in Madrid with Nobuko Imai. Kasai has performed chamber music with eminent musicians such as Lawrence Power, Ivan Monighetti, Sayaka Shoji, and Bruno Delepelaire. He is a scholar of the Seiji Ozawa Academy Switzerland and the Villa Musica Rheinland Pfalz.