A violist of international reputation, Roberto Díaz is president and CEO of the Curtis Institute of Music, following in the footsteps of renowned soloist/directors such as Josef Hofmann, Efrem Zimbalist, and Rudolf Serkin. As a teacher of viola at Curtis and former principal viola of the Philadelphia Orchestra, Mr. Díaz has already had a significant impact on American musical life and continues to do so in his dual roles as performer and educator. Since founding Curtis on Tour eight seasons ago, Mr. Díaz has taken the hugely successful program to North and South America, Europe and Asia, performing chamber music side-by-side with Curtis students and other faculty and alumni of the school. His tenure as president of Curtis has also seen the construction of a significant new building which doubled the size of the school's campus; the introduction of a classical guitar department and new conducting and string quartet programs; the launch of Curtis Summerfest, summer courses open to the public; and the debut of an online stage called Curtis Performs. In the fall of 2013 Curtis became the first classical music conservatory to offer free online classes through Coursera. In addition to his decade-long tenure as principal viola of the Philadelphia Orchestra, where he performed the entire standard viola concerto repertoire and gave a number of Philadelphia Orchestra premieres, Mr. Díaz was principal viola of the National Symphony under Mstislav Rostropovich, a member of the Boston Symphony under Seiji Ozawa, and a member of the Minnesota Orchestra under Sir Neville Marriner. Mr. Díaz plays the ex-Primrose Amati viola.