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Board of Directors

Nathaniel Adams — Board Member

Nathaniel Adams, 33, 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.).

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.

Steve Benson — Board Member

Steve Benson has been principal trombonist for Calliope since 2007 and a member of the board since 2017.  He plays in a number of other musical ensembles around the Greater Boston area, including Summer Street Brass, the Waltham Philharmonic Orchestra, and pit orchestras for musical productions at MIT and Harvard.  He has a PhD in mathematics from the University of Illinois and teaches at Lesley University and the University of New Hampshire.

Jacques Dupuis — Music Director

Jacques Dupuis is a Boston-based conductor and musicologist. He has been singing with Calliope since the summer of 2012, assuming the role of assistant music director beginning in summer 2013. 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 domestic vocal music of Robert Schumann.

Katherine Gilliland — Board Member

Katherine Gilliland has been a Calliope member (alto) since 2009 and has sung in choral organizations for many years.  She has a background in art history and is the Docent Manager at the John F. Kennedy Presidential Library and Museum in Boston.  Katherine's areas of expertise include volunteer management, event planning, research, and writing.  

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.

Katie Mason — Board Member

Katie Mason has played French horn as a regular member of Calliope since 2011. She has also served as manager of Calliope's Ensemble-in-Residence program. Outside of Calliope, Katie works as a patent paralegal and holds the Third Horn chair with the Norwalk Symphony Orchestra.

Julia O’Toole — Founder

As founder and Music Director of Calliope, Julia delights in an 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. Since graduating from Boston University with a BFA in vocal performance, she has received a Master's Degree in Musicology from Brandeis University, and is currently pursuing a doctorate in Historical Musicology from Boston University. She teaches voice throughout the Boston area, substitutes as conductor for local organizations, and regularly teaches, publishes, and presents on various musicology topics.

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.

Margaret Sullivan — Board Member

Margaret is someone for whom, as a result of the sound, the beauty, and the emotion, music creates an elemental “feel” that is appreciated on a number of levels. Her background in German studies, history, and education inspired her while in Europe to explore music first as a listener, and then as a participant in choirs sacred and secular. She shares her interest in all aspects of instruments and singing with her sons Daniel and William, who are also very musical. She has worked at Milton Academy directing Understanding Differences, a program that teaches fourth graders about individuals with learning and living challenges. In addition to her participation on the Board of Calliope, she sits on the Board of the Maria Droste Center, which supports recovering individuals who capitalize on their talents such as music, ultimately playing a significant role in redirecting their lives. She was a vibrant part of Calliope’s pilot season.

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.

John Verkuilen — Interim Artistic Director

John Verkuilen is a Boston-based conductor and vocalist. John first joined Calliope last winter as the Assistant Music Director and was later appointed Interim Artistic Director. John came to Boston to study choral conducting at The Boston Conservatory where he also spent significant time working with the opera and orchestral departments. John also currently serves as Artistic Director of Sine Nomine, a 24-voice ensemble in Fall River, MA. John earned a BA in International Studies, Economics, and Music from Macalester College in St. Paul, MN. After graduating, he was appointed Macalester's Assistant Choral Conductor, began a music liturgy internship at St. Olaf Catholic Church in Minneapolis, and performed five shows as a member of the Minnesota Opera.