In 1999, signed with avex entertainment as a song writer and a producer and wrote songs for artists: "Ayumi Hamasaki", "Kumi Koda", "EXILE", "BoA" etc. Ayumi Hamasaki's Album "DUTY" was sold over 3million copies and made Ken famous among the industry.
Also, produced a theme song for famous MMA entertainment "PRIDE F.C" (FUJI TV), 2011 produced a theme song for Formula 1 (FUJI TV).
2012, the Ken tags with a singer / song writer "CEYREN", and the president at AVEX, "Max" Matsuura named Ken's project "BOLDO" to start his new courier in Japan and World wide to do what he does best.
First single "Everyday, Everynight" is going to be released this summer from a hit compilation album "HOUSENATION" (AVEX).