hes controversial but his stuff is amazing...he doesn't get much mention here because hes very different from traditional PUAs.
while many of us have different "pickup" approach, but the back end of his game on escalation till sex is great material. he emphasizes directness and efficiency over smoothness.
but ive taken his approach philosophy and applied it at EDM events. (see my thread on electronic music events)
attraction formula is his main book, he also wrote a great lil manifesto called get laid in NYC. but his video video series beyond digits is great too.
look him up on youtube. he has some great seminar videos he gave the morten hake's summit.