Violist Roberto Díaz has been president of the Curtis Institute of Music since 2006. His tenure as president of Curtis has seen the introduction of Curtis On Tour, classical guitar and string quartet programs, the launch of Curtis Summerfest, the debut of an online stage called Curtis Performs, and a newly conceived conducting program. Before his tenure at Curtis, he was principal violist of the Philadelphia Orchestra, where he performed the entire standard viola concerto repertoire with the orchestra and gave a number of Philadelphia Orchestra premieres. Mr. Díaz frequently performs as a soloist and collaborates with leading conductors. He has also worked with important 20th- and 21st-century composers, including Krzysztof Penderecki, Edison Denisov, Roberto Sierra, and Jennifer Higdon. As a chamber musician, he has toured Europe, Asia, and the Americas as a member of the Díaz Trio with violinist Andrés Cárdenes and cellist Andrés Díaz. The Díaz Trio has recorded for the Artek and Dorian labels. Mr. Díaz's many other recordings include the complete works for viola and piano by Henri Vieuxtemps, a Grammy-nominated disc of viola transcriptions by William Primrose, and the Brahms sonatas with Jeremy Denk. Other releases include the Walton Viola Concerto with the New Haven Symphony and William Boughton (Nimbus) and the Viola Concerto by Peter Lieberson with the Odense Symphony Orchestra and Scott Yoo (Bridge Records).