Masumi regularly tours internationally and has performed at many of the most prominent festivals, including Marlboro, Spoleto USA, Music@Menlo, Caramoor, Music in the Vineyards, Bowdoin, and the Aspen Music Festival. His guest violist collaborations include programs with the St Lawrence, Ying, Pavel Haas, Miró, Verona, and Emerson String Quartets, as well as with the Horszowski Trio. He toured and recorded extensively as a former member of the International Sejong Soloists. He can be heard on the Cedille Records, Naxos, Hyperion, Musical Observations, Bridge, and Tzadik record labels.

As a member of the Pacifica Quartet for almost two decades (2001-2017), Masumi regularly performed in the world’s greatest halls including Amsterdam’s Concertgebouw, Tokyo’s Suntory Hall, Sydney’s City Hall, New York’s Carnegie Hall and Lincoln Center, London’s Wigmore Hall, Vienna’s Konzerthaus and Musikverein, Munich’s Herkuleshaal, Paris’ Louvre and Cité de la Musique, and Berlin’s Konzerthaus among many others. He was full professor of viola and chamber music as quartet-in-residence at Indiana University’s Jacobs School of Music. In 2006, the ensemble was awarded the coveted Cleveland Quartet Award, Avery Fisher Career Grant, and they were also named Musical America’s 2009 Ensemble of the Year.

Masumi is an ardent advocate for the arts, and often sought after as a contributing writer to such publications as the Huffington Post, Strings and Gramophone magazines as well as The Guardian.

Passionate about breaking down barriers that prevent people from enjoying Classical music, Masumi was the founder of DoCha, a chamber music festival in Champaign, Illinois that produced innovative events with a focus on engaging new audiences through fun and inventive programming. DoCha-hosted events featured unique collaborations between members of the University and multi-genre presentations from Classical chamber music to contemporary dance, the spoken word, and much more. All programs were free of charge and took place at a beautiful former community Opera House. Other activities of DoCha, included ‘in-reach’ performances for elementary school students as well as master classes, competitions and performance opportunities for local music students.

Masumi has served on the faculties of the University of Illinois at Urbana-Champaign, Jacobs School of Music at Indiana University, The University of Chicago, Longy School of Music, and Northwestern University. He has given master classes at The Colburn School, Cleveland Institute of Music, The Aspen Music Festival, Bowdoin International Music Festival, Interlochen and San Francisco Conservatory among many others.

He received his Bachelor and Master of Music degrees from The Juilliard School. There, he studied with legendary violist and pedagogue Karen Tuttle from the age of 17 and was made her teaching assistant just three years later at the age of 20. At Juilliard, he was awarded the ‘Lillian Fuchs Award’ for the most outstanding graduating violist. He also won the Juilliard School Concerto Competition and performed the world premiere of Michael White’s Viola Concerto in Lincoln Center’s Avery Fisher Hall, with conductor James DePreist. That same year he gave the New York premiere of Paul Schoenfield’s Viola Concerto with the Juilliard Symphony to critical acclaim. In 2008 he was awarded the ‘Rising Star Award’ by the Third Street Music School Settlement for his musical achievements

Masumi lives in Rochester, NY with his wife Sonia – a concert pianist – and their daughter, Ling. He is professor of viola and chamber music at the Eastman School of Music. He is a D’Addario Artist and has used their strings since 1999. Celebrating a 400 year birthday in 2019, his Amati viola was crafted in Cremona, Italy in 1619.