In addition to his teaching and conducting at the Preparatory, Horwitz-Lee is Middle and Upper School String Orchestra Director at the Bryn Mawr School and a teacher at Loyola College. He regularly coaches violin section rehearsals for the Greater Baltimore Youth Symphony Orchestra. Horwitz-Lee holds violin performance degrees from Rice University and the University of Maryland, College Park. Influences and teachers include Mimi Zweig, Rebecca Henry, Kathy Winkler, and Daniel Heifetz. He was a member of Symphony Pro Musica, served as concertmaster of the Vivaldi Festival Orchestra for three years, and has performed with the Washington National Opera as Principal Violin. His students have won many honors and competitions to perform as soloist with orchestra including the Columbia Orchestra, Frederick Symphony Orchestra, Youth Festival Orchestra of JCC, the Peabody String Ensemble, the Young Artist Orchestra of Peabody and the highest level Peabody Youth Orchestra.