Based in New York City, Dennis K. Sullivan II is a percussionist, composer, and electronicist, focusing on new and contemporary music. His music has been performed across the globe by the International Contemporary Ensemble, yarn/wire, New Thread Quartet, DECODER, Ensemble Adapter, Hypercube, and Dal Niente in venues such as the Elbphilharmonie (Hamburg), The Stone (NYC), Nymusikk Bergen (Norway), Omaha Under the Radar, Splendor (Amsterdam), and the Edmonton Fringe Festival (Canada). He is a founding member and core performer in Radical 2, a classification-defying duo that explores the use of theatric, vocal, percussive, and prototype electronic mediums, and Popebama, an experimental duo that applies text, electronics, and high-energy performances to non-traditional sounds.

An active chamber and orchestral percussionist, Sullivan has shared the stage with leading contemporary music ensembles such as The Argento New Music Project, Either/Or, The International Contemporary Ensemble, ECCE Ensemble, Ensemble Court Circuit (Paris), Ensemble Pamplemousse, Wavefield Ensemble, Newband, Mivos Quartet, The Darmstadt Preistrager Forum, and Ensemble Modern Academy, among others. He has performed in notable NYC venues such as BAM, Roulette, Merkin Hall, Miller Theater, Symphony Space, Le Poisson Rouge, The Shed, and The Stone. An advocate for the new music community, Sullivan successfully curated an annual series of theatrically driven new music, bringing together classical music, theater, rock, heavy metal, and film at Jack (Brooklyn) from 2015-17.

Performance awards include grand prize at the Van Rooy Competition for Musical Excellence, the Stipiendienpreise at the Darmstadt International Ferienkurse fur Neue Musik (Darmstadt, Germany) and a STEIM Center composer residency for electroacoustic music (Amsterdam, Netherlands). Sullivan has recorded for the New Amsterdam, Mode, GoldBolus, New Focus, Original Abstraction and INNOVA labels.

Sullivan holds a Bachelor of Music (BM) from the Hartt School of Music and Master of Music (MM) / Doctorate of Musical Arts (DMA) from SUNY Stony Brook University (New York). Sullivan currently serves as instructor of percussion and music tech as well as director of the wind ensemble at Adelphi University.