Rob McCullough's MT credentials?

What are Rob McCullough's credentials in the world of Muay Thai or kickboxing?

I'm interested in buying his instructional set sold on www.islandmartialarts.com but I'd first like to know what kind of credentials he has in Muay Thai or Kickboxing as opposed to MMA.

If anybody has any info in this regard, please share it.

TTT

ttt