His music reflects an ongoing interest in processes inspired by natural phenomena, frequently incorporating theatrical elements as part of the musical narrative. Klein's works have been performed and broadcast internationally, and have been recognized by such organizations as the National Endowment for the Arts, the American Composers Forum/Jerome Foundation, the American Music Center, the Gaudeamus Foundation, and ASCAP. He holds degrees in composition from Indiana University, University of California, San Diego, and California State Polytechnic University, Pomona, and his composition teachers have included Harvey Sollberger, Claude Baker, Robert Erickson, and Roger Reynolds. Klein is currently Distinguished Teaching Professor at the University of North Texas College of Music, where he has served as Chair of Composition Studies since 1999.