Originally from Tokyo, Japan, Yumiko Matsuoka is a Berklee graduate and a professor in the Ear Training department. She has also taught vocal writing in the Contemporary Writing and Production department. Yumiko is the founder of the Boston-based a cappella quintet Vox One, whose albums Vox One, Out There, Chameleon, and Pure Imagination have won multiple awards from the Contemporary A Cappella Society of America (CASA). Vox One has performed locally as well as nationally, and has toured in Japan several times.

Her arrangements and compositions can also be heard on her anthology To Every Thing There Is A Season, Vox One's Say You Love Me, and on recordings by other a cappella groups around the globe. Recent works include arrangements of the Beatles songs for Houston Chamber Choir, a composition celebrating Shakespeare's 400th anniversary for Stile Antico and Folger Consort, as well as chapters on a cappella arranging for A Cappella Perfect Book Advanced, published in Japan. Yumiko has also written for Japanese TV commercials including Toyota, Sharp, Meiji Seika, and Japan Energy Corporation. Some of her arrangements have been published by the University of Northern Colorado Jazz Press and by Edition Kawai in Japan. She is active as a coach and adjudicator, and gives workshops throughout the U.S., Japan, and Korea. Since 1998, she has served as an adjunct faculty member for ensemble singing workshops hosted by a New York-based ensemble, the Western Wind.