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Board of Directors and Administration

Colleen Martin — President

Colleen Martine has been a Calliope member (alto) since 2013. She was the section leader for the altos for two years and the recipient of the Kathy Koniuto Chair in 2015. Colleen also performs with two other choral groups. As a marketing professional with experience in marketing planning, research, communications, project management, and strategic planning, she has worked in both for- and non-profit organizations. Currently she runs her own company, CRM Marketing services.

Patrick Valentino —  Music Director & Conductor

Patrick Valentino became Music Director of Calliope in the 2019-2020 season. As a composer and a conductor, his performances enliven well-known repertoire and guide audiences through seldom-explored pieces. In demand in the Boston area and beyond, he has served as Music Director of the Bay Colony Brass, Assistant Conductor for the Ithaca College Orchestras, Westfield Symphony and Symphony NOVA. He has conducted the Monmouth Symphony, Cornell Symphony Orchestra, Symphony NOVA, the Mihail Jora Philharmonic, Massive Brass and the St. Petersburg Music Society.

Patrick’s music has been performed by the Nashua Symphony, Monmouth Symphony, Central New Jersey Symphony, Oak Ridge Community Orchestra, the Brevard Music Center, Ariel String Quartet, and the brass ensembles of the Moscow Conservatory, among others.

Robert C. Adams — Board Member, Treasurer

Robert Adams has spent his career in non-profit management, including positions in project management, marketing, and strategic and business planning. He now works as a consultant to non-profit organizations.  Bob sang as a chorus member and soloist with the Dedham Choral Society for 13 years, serving also as Vice President and President.  He currently sings with Boston's Back Bay Chorale as a chorus member and soloist, and sang in Calliope's pilot concert in 2006.

Sabrina Ellis — Board Clerk, Membership Director

Sabrina Ellis has been a Calliope member (alto) since 2015. She is originally from Central Massachusetts and attended New England Conservatory of Music and has a degree from Harvard University. Sabrina specializes in the bel canto/Italian song repertoire and is the music director of an exciting new company, Opera Talk Italy.

Jacques Dupuis — Board Member

Jacques Dupuis is a Boston-based conductor and musicologist. He has been singing with Calliope since the summer of 2012, assuming the roles of assistant music director from 2014 to 2017 and artistic director from 2017 to 2018. Outside of his work with Calliope, he has worked with a wide range of ensembles, from church choirs to new music ensembles, and small to large choral groups. Holding a BA in music history and theory and Italian studies from the University of Notre Dame and an MFA in musicology from Brandeis University, he has studied conducting with Daniel Stowe and Emmett O'Leary at Notre Dame and with Neal Hampton at Brandeis. He is currently pursuing a PhD in musicology at Brandeis, writing a dissertation on the domestic vocal music of Robert Schumann.

Nathaniel Adams — Board Member

Nathaniel Adams is an associate at the Boston office of an international law firm.  His practice focuses on corporate transactions, primarily mergers and acquisitions.  Before becoming a lawyer, he worked for three years as an editor and writer at the Improper Bostonian magazine.  He has substantial musical performance experience, primarily in voice and piano, as well as formal training in music theory and composition.  A Boston native, he is a graduate of the University of Virginia (B.A.) and Columbia Law School (J.D.).

Yanko Sheiretov — Board Member

Yanko Sheiretov joined Calliope as a clarinet player in 2008 and the board in 2017. He is very active in the Greater Boston avocational music community and has played with many symphony orchestras and opera houses. He currently holds the principal clarinet positions at the Wellesley Symphony Orchestra and at Calliope. Yanko holds a Ph.D. in electrical engineering from MIT and is currently employed in the medical device industry.

David McSweeney — Advisor

David is president and founder of Tenor Technologies (, a consulting company that provides new-media solutions for arts organizations. Before forming Tenor Technologies, he held numerous executive positions in Massachusetts high-tech companies, and he has 20 years’ experience in the technology sector. As a freelance singer, David appears regularly with several local ensembles, including Boston Baroque, Emmanuel Music, Blue Heron Renaissance Choir, and the Handel & Haydn Society. He has also appeared as a soloist with the Arlington Philharmonic Society, Boston Cecilia, Monadnock Music, and the Wellesley Choral Society.

Julia O’Toole — Founder, Artistic Director Emerita

As founder and Music Director of Calliope, Julia delighted in the opportunity to lead musicians from a variety of Boston area choruses and orchestras. Having worked with several of these organizations previously in the capacity of vocal and performance coach, familiarity with the passion of their members inspired the dawn of Calliope. She earned a BFA in vocal performance from Boston University, a Master's Degree in Musicology from Brandeis University, and a PhD in Historical Musicology from Boston University. She taught voice throughout the Boston area, substituted as conductor for local organizations, and regularly teaches, publishes, and presents on various musicology topics.