Benjamin Wynn, known also as Deru, is an American composer, sound designer and music producer mostly known for creating the sound design for the TV series Avatar: The Last Airbender. He has collaborated with composers such as Joby Talbot. He is the co-owner of The Track Team, a music and sound production company based in Los Angeles, and also produces electronic music under the name "Deru". He is the grandson of neurosurgeon Joseph Ransohoff.