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Benjamin Wynn, (Benjamin Matfield Wynn, born 1979) 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 also produces electronic music under the name "Deru". He is the grandson of neurosurgeon Joseph Ransohoff. Wikipedia