Tomoki Sumiya studied double bass at Tokyo National University of Fine Arts and Music in Japan, and Violone with Maggie Urquhart at the Royal Conservatory of The Hague in The Netherlands. He has a particular interest in Viennese solo bass works of the 18th century. This interest led him to further research the Viennese bass which culminated in the writing of an article that was published in "The Viol" magazine in Spring 2010. Tomoki has a very active performing life and has played with numerous ensembles and orchestras including La Petite Bande (directed by Sigiswald Kuijken), Orchestre Révolutionnaire et Romantique (directed by John Eliot Gardiner), and Sinfonia Rotterdam (directed by Conrad van Alphen). Tomoki is a founding member of The Den Haag Piano Quintet, which in 2011 won 1st prize in The International Van Wassenaer Ensemble Competition in the Netherlands. Tomoki was awarded the "Best Individual Musician Award" in the same competition.