Marcy Rosen made her concerto debut with the Philadelphia Orchestra at age eighteen. She was a member of the Cantelina Chamber Players and the Mendelssohn Quartet in 1986 when they made their recording debut with String Quartet No. 11 (Dvořák), Op. 61. She has since appeared with the Dallas Symphony, the Phoenix Symphony, the Caramoor Summer Music Festival Orchestra, the Orpheus Chamber Orchestra in Carnegie Hall, the Jupiter Symphony and Concord Chamber Orchestra at Alice Tully Hall, and the Tokyo Symphony. Rosen has served on the faculties of the North Carolina School of the Arts, the Eastman School of Music, the New England Conservatory of Music and the University of Delaware. She has acted as the artistic co-director of the Chesapeake Chamber Music Festival. As of 2014, Rosen was Assistant Professor of Cello at the Aaron Copland School of Music at Queens College and on the Faculty at the Mannes College of Music in New York City, as well as continuing to perform and record professionally.