Martin Lee Stephenson is a British experimental sound artist, musician, producer and songwriter from London. He is one half of the experimental act Spooncurve (with Faye Rochelle) and the composer/producer for the occult/hermetic inspired dark ambient project Apollon (apollon93). He also records under the names of Doppler 20:20 and Vulse. At the end of 2012, he had released more than 150 recordings. The primary labels of these releases were recording companies Sony, BMG, EMI, AVEX and independent labels D.O.R., Copasetic, Better, Reel 2 Reel, Law and Auder, Sub and Bleep, Slammin', Quirky, 3MV, Pro One, Squat, Keda and Offspring Records.