I believe he is a hypnotist, amongst other things. I think he uses showmanship, like he says, psychology in terms of suggestibility, and playing with our memory - making somethings stick in it whilst making us forget other things.
He's a VERY clever man! As well as very attractive, in a disturbing way!
I love Derren Brown. Been to see him live. There is NO such thing as magic.. well not in his terms. There's a scientific answer to almost everything.. and those questions that haven't been answered scientifically, yet, certainly will be in future. Derren Brown is very honest about his 'fakeness'... he exploits those who make money from pretending to be 'real'.. be it psychics, mediums... anything along those lines.
He's such an intelligent, inspirational person. He opens our eyes to the psychology behind evertyhing.