What to do when the father won't pay child support?

My son's father Marsan Q. Champion quit his job as an assistant principal and moved out of the state of Florida to California to prevent himself from paying child support. He has written books, joined a cyber radio station, mentors children, have a facebook and twitter account and a business called S.O.U.L writing seminar not to mention he calls himself Dr. Marsan Champion because he has supposedly received his doctorates degree from Nova University. How is it possible child support can't find him. His whole bio is on the internet. What can I do?