Yes, he is quite the character and a legitimate mathmetician^. I also looked into him and questioned his validity after first reading his opinions.

I read a paper by him on ultrafinitism^^ a few years ago and was intrigued and entertained.

^ http://en.wikipedia.org/wiki/Doron_Zeilberger

^^ http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimPDF/rea...