Praised as a “gorgeous, mellifluous mezzo...  with vivid expression and engaging intensity" by the Boston Musical Intelligencer, mezzo-soprano ROSELIN OSSER has established a reputation as a dynamic performing artist. In February 2023 she made her Boston Lyric Opera debut as Hansel in their Artist Classroom Visits production of Hansel and Gretel, introducing opera storytelling to hundreds of Boston area students from kindergarten through 10th grade.

With the panache of a mezzo Marx Brother, Osser has particularly excelled in comic and whimsical opera roles including Angie in Pepito with Opera del West, The Fox in The Little Prince with NEMPAC Opera Project, The Astronomer in Jack and Jill and the Happening Hill with Salt Marsh Opera, the title role in El Gato con Botas (the Spanish “Puss-in-Boots”) with OperaHub, Cherubino in Le nozze di Figaro with Manhattan Opera Studio, Pitti-Sing in The Mikado with Opera Providence, and Rosina in The Barber of Seville with Longwood Opera.  Among other audacious character portrayals, The New England Theater Geek described her as having the “wild eyes, swagger, and exquisite cheekbones of a villain [who] dominates the stage” for her performance as the title Roman dictator in Handel’s Silla with the Cambridge Chamber Ensemble.

An accomplished and passionate concert artist, recent seasons have included alto soloist debuts in Bach's Magnificat with the Providence Singers, Mozart's Requiem with the Masterworks Chorale in Sanders Theater at Harvard University, Handel's Messiah with the Mystic River Chorale and Orchestra, Pergolesi’s Stabat Mater with the Easton Chamber Music Festival, Mendelssohn’s Elijah with both the Heritage Chorale and the Pioneer Valley Symphony Orchestra, and Mozart's Vesperae Solennes de Confessore with the Choral Art Society of the South Shore.  Other concert appearances include guest soloist with the Salem Philharmonic Orchestra, the Waltham Philharmonic Orchestra, Encore Opera of Rhode Island, The Bostonians with the University of New Hampshire Celebrity Series, and a celebration of Leonard Bernstein's Broadway hits with Temple Emanuel of Newton, Massachusetts.  The Boston Musical Intelligencer recently praised Osser's "artful phrasing and dulcet warmth" for a concert of florid excerpts from Rossini's Semiramide with the Freisinger Chamber Orchestra.  She made her professional recording debut on Rumbarroco and La Donna Musicale's recently released CD "Latinas InFusion" singing an original arrangement of the 1945 Frank Sinatra and Doris Day hit song "The Last Time I Saw You," with lyrics written by Osser's own grandmother Edna Osser.

A two-time first place prizewinner in the Maine National Association of Teachers of Singing (NATS) Song Festival, Osser has combined her lifelong passion for performing arts with strong motivation to reduce human impact on the environment.  She earned degrees in Mechanical Engineering and Building Technology from Tufts University and the Massachusetts Institute of Technology (MIT) in parallel to her vocal studies, now balancing an unusual dual career as both a classical singer and an energy consultant for prominent New England green building projects.