Dmitri Tymoczko is an American composer, music theorist, and pianist recognized for his innovative exploration of harmony and geometry in music. Born in 1969, he serves as a professor of music at Princeton University, where his research bridges classical theory, contemporary composition, and mathematical modeling of tonal space. His influential book A Geometry of Music: Harmony and Counterpoint in the Extended Common Practice (2011) introduced a novel analytical framework for understanding musical structure. As a composer, Tymoczko’s works have been performed internationally, noted for blending tonal and modernist elements. His contributions have significantly advanced contemporary music theory and composition.