Former guitarist for rock bands Poison and Mr. Big. He was fired from Poison when it was discovered he was in a romantic relationship with his band-mate Rikki Rockett's fiancée, Deanna Eve.
In 2006 recorded and released the Ai Senshi album. This was a
collection of theme music from the Japanese Anime series Gundam,
rerecorded by Kotzen and sung entirely in English.
As a solo artist, opened for The Rolling Stones' "A Bigger Bang Tour" in Japan. (March 2006)
Only played on one Poison album - 1993's Native Tongue. His song "Stand" made it to Billboard's Top 20.