His singing has taken him to many venues and festivals such as Lincoln Center, the Metropolitan Museum of Art, Washington National Cathedral, Tanglewood, the Early Music Festivals of Boston, Regensburg, San Francisco, Houston, Tucson, Washington DC, and Madison, as well as Monadnock Summer Music Festival.  

Aaron has recorded and toured the U.S. and Europe with Paul Hillier’s Theater of Voices, as well as Fortune’s Wheel, and appears on the 2007 Grammy nominated recording of Lully’s Theseé, and the recently released Lully’s Psyche, with the Boston Early Music Festival.  He still performs regularly with Blue Heron Choir, Fortune’s Wheel, and La Donna Musicale. 

Aaron received a BA from Luther College and a MM in Early Voice Performance from Indiana University.   He has given masterclasses at Yale University, Case Western Reserve University, Brown University, and Wellesley College, as well as being on the faculty of the Madison Early Music Festival at the University of Wisconsin.   Aaron teaches on the faculties of Wellesley College, Case Western Reserve, and Brown University.

Aaron made his debut with Intermezzo as Arthur Rimbaud in the world premiere of David Paul Gibson's Verlaine and Rimbaud and has returned for Kurt Weill's The Seven Deadly Sins and Erik Satie's Socrate. He takes on the title role in Benjamin Britten's The Prodigal Son in September, 2009.