Penn started producing house and techno tracks under a variety of pseudonyms beginning in 1992. In 1993 he signed with the Arcade Music Group and founded the sublabel Zen Records. He also created the U.P.N. Team production squad, with Juan Carlos Molina and Enrique Pascual Mejia (Enrique P.). Penn broke into the mainstream in 1995 with the release "The Nighttrain", under the alias Kadoc, where he first worked with DJ Chus, who co-produced the track with the U.P.N. Team.In 1998 he ended his previous associations with Molina and Enrique P. and started working more closely with Toni Bass and DJ Chus. He signed with Milk & Sugar Recordings and Stereo Productions and in 2003 restarted Zen Records under the name Urbana Recordings. Penn also had tracks released by Defected Records.As a remixer, he has worked for Junior Jack, Michael Gray, Shapeshifters, DJ Cam, Milk & Sugar, Chic and Scissor Sisters.