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"Miss O'Sullivan is an agile, eloquent player" (New York Times), performing extensively on baroque, classical, and modern cello. As a member of the Four Nations Ensemble, she has appeared on the Great Performers series at Lincoln Center, and at the Kennedy Center, the Metropolitan Museum of Art, Merkin Concert Hall, and the New York Historical Society, as well as at the Mostly Mozart Festival, the Festival of Arts and Ideas at Yale University, and Tema Culturais in Brazil. The ensemble has recorded for Gaudeamus. With the Haydn Baryton Trio and the Classical Quartet, she toured throughout Europe, and recorded with Dorian, Titanic, and Harmonia Mundi.

Loretta has played continuo cello for many ensembles including Opera Lafayette, Florida Grand Opera, the New York Collegium, Aston Magna, the American Bach Soloists, the Bach Choir of Bethlehem, the Grand Tour, Artek, and The Washington Bach Consort. She frequently plays with the Orchestra of St. Luke's. Her performances for solo cello in recent years include the Bach Suites, her transcription of Heinrich Biber's Passacaglia, Gabrielli's Ricercar, Benjamin Britten's Third Suite, and "Junction of Tranquility and Fervor" with the Paul Taylor 2 Dance Company.

In collaboration with Larry Lipkis, she gave a pre-concert lecture for Yo-Yo Ma's performance of the Bach Suites in Bethlehem, Pennsylvania, and has given master classes at Brooklyn College and the University of Iowa. Loretta has coached Performance Practice at Rutgers University, and assisted in preparing Baroque cellists for a 2009 Masterclass with William Christie at The Julliard School of Music.

You can track her many activities at loscello.com/