He has conducted and recorded with groups such as the Russian National Symphony and the Brno Philharmonic for Albany Records, Centaur, IRIDA and Naxos.South Florida Classical ReviewDistinguished Achievement Award "Sleeper is a highly talented composer who has written a large body of works in wide ranging genres... the premiere of his Violin Concerto (Hypnagogia) in a stunning performance by Huifang Chen with conductor Andres Jaime, delivered a worthy addition to the repertoire, a showpiece of romantic hues and barn-burning bravura. As both conductor and composer, Sleeper remains one of the brightest lights of the Frost faculty." - Lawrence Budmen