His singing has taken him to many festivals and venues including; Tanglewood, Lincoln Center, the Metropolitan Museum of Art, Washington National Cathedral, the early music festivals of Boston, San Francisco, Vancouver, Houston, Tucson, Washington DC, and Madison, as well as the Regensburg Tage Alter Musik.
Known especially for his Baroque interpretations, his voice has been described by the Boston Globe as "superb: his tone classy, clear, and refined, encompassing fluid lyricism and ringing force" and the Washington Post praised his "Polished, lovely tone."
In the concert world, Aaron has made a name as a first rate interpreter of the oratorios and cantatas of Bach and Handel. The San Diego Classical Voice said, "Tenor Aaron Sheehan performed the role of Evangelist, and sang with assured vocal and linguistic fluency, tasked with telling the audience the story while imparting its drama. In this regard, he was superb."
He has appeared in Concert with Orpheus Chamber Orchestra, American Bach Soloists, Handel and Haydn Society, Boston Baroque, North Carolina Symphony, New York Collegium, Charlotte Symphony, Boston Cecilia, Charleston Bach Festival, Baltimore Handel Choir, Les Voix Baroque, Pacific Chorale, Boston Early Music Festival, Tempesta di Mare, Aston Magna Festival, Bach Collegium San Diego, Washington National Cathedral, Pacific Music Works, Boston Museum Trio, Magnificat, Tragicomedia, the Folger Consort, and Concerto Palatino.
On the opera stage, Aaron made his professional debut in 2005 as Ivan, in the Boston Early Music Festivals world premiere staging of Mattheson's Boris Gudenow, a role in which Opera News praised his voice as "Sinous and supple". He has since worked with the company in leading roles such as L'Amour and Apollon in Lully's Psyché, Actéon in Charpentier's Actéon, and as Acis in Handel's Acis and Galatea. He also has worked on the opera stage with American Opera Theater and Intermezzo Chamber Opera in leading roles of operas by Cavalli, Handel, Weill, and Satie.
Aaron also continues to work extensively in the chamber music world. He has sung with Theater of Voices, Blue Heron Choir, Tenet, Fortune's Wheel, La Donna Musicale, Folger Consort, Newberry Consort, Dünya, The Rose Ensemble, and the Pro Arte Singers.
Aaron has appeared on many recordings, including the Grammy nominated operas Thésée and Psyché of Lully, recorded with BEMF on the CPO label.
A native of Minnesota, Aaron holds a BA from Luther College and a MM in Early Voice Performance from Indiana University. He is currently on the voice faculties of Boston University, Wellesley College, and Towson University.