Mezzo-soprano Marcia Gronewold Sly, founder and Executive Director of Blue Hill Bach, has appeared with organizations that include American Bach Soloists, Philharmonia Baroque Orchestra, San Francisco Opera, Bangor Symphony Orchestra, and the Kronos Quartet, working with such esteemed conductors as Kent Nagano, Nicholas McGegan, Joanne Falletta, and William McGlaughlin. She has sung in premier performances and recordings of numerous works. Marcia holds degrees from San Francisco Conservatory of Music, San Francisco State University, and Mills College. As a writer and arts administrator, she has worked with organizations that include San Francisco Opera, Northeast Historic Film, and the Young Musicians Program of U.C. Berkeley. She has taught voice at University of Maine, Orono, the Young Musicians Program, and San Francisco Community Music Center, and now teaches in her private studio in Brooklin.