Castellain works from his own studio, which is a hybrid of analog and digital, which allows for many possibilities. He has composed music in many Genres, Rock, Techno, Classical, Metal, world, Jazz Fusion. he is best known for his guitar work which has seen him work with many Australian and International Acts. He has toured with David Lee Roth, along with Steve Vai and has worked as a session player for years including tracks in David Briggs production workshop(Little River Band).