For more than a decade the works of American composer Roberto Sierra have been part of the repertoire of many of the leading orchestras, ensembles and festivals in the USA and Europe. At the inaugural concert of the 2002 world renowned Proms in London, his Fandangos was performed by the BBC Symphony Orchestra in a concert that was broadcast by both the BBC Radio and Television throughout the UK and Europe. Sierra's numerous commissions include works for many of the major American and European orchestras. International ensembles that have performed his works include the orchestras of Philadelphia, Pittsburgh, Atlanta, New Mexico, Houston, Minnesota, Dallas, Detroit, San Antonio and Phoenix, as well as by the American Composers Orchestra, the New York Philharmonic, Los Angeles Philharmonic, National Symphony Orchestra, Royal Scottish National Orchestra, the Tonhalle Orchestra of Zurich, the Spanish orchestras of Madrid, Galicia, Castilla y León and Barcelona, among others.

Commissioned works include: Concerto for Orchestra for  the centennial celebrations of the Philadelphia Orchestra commissioned by the Koussevitzky Music Foundation and the Philadelphia Orchestra; Concerto for Saxophones and Orchestra commissioned by the Detroit Symphony Orchestra for James Carter; Fandangos and Missa Latina commissioned by the National Symphony Orchestra of Washington DC; Sinfonía No. 3 "La Salsa", commissioned by the Milwaukee Symphony Orchestra; Danzas Concertantes for guitar and orchestra commissioned by the Orquesta de Castilla y León; Double Concerto for violin and viola co-commissioned by the Pittsburgh and Philadelphia Orchestras; Bongo+ commissioned by the Juilliard School in celebration of the 100th anniversary; and Songs from the Diaspora commissioned by Music Accord for Heidi Grant Murphy, Kevin Murphy and the St. Lawrence String Quartet.

In 2003 he was awarded the Academy Award in Music by the American Academy of Arts and Letters. The award states:  "Roberto Sierra writes brilliant music, mixing fresh and personal melodic lines with sparkling harmonies and striking rhythms. . ." His Sinfonía No. 1, a work commissioned by the St. Paul Chamber Orchestra, won the 2004 Kenneth Davenport Competition for Orchestral Works. Roberto Sierra has served as Composer-In-Residence with the Milwaukee Symphony Orchestra, The Philadelphia Orchestra, The Puerto Rico Symphony Orchestra  and New Mexico Symphony.

Roberto Sierra's Music may be heard on CD's by Naxos, EMI, New World Records, Albany Records, Koch, New Albion, Koss Classics, BMG, Fleur de Son and other labels. In the spring of 2004 EMI Classics released his two guitar concertos Folias and Concierto Barroco with Manuel Barrueco as soloist (released by Koch in the USA on 2005). Roberto Sierra was born in Vega Baja, Puerto Rico, and studied composition both in Puerto Rico and Europe, where one his teachers was György Ligeti at the Hochschule für Musik in Hamburg, Germany.