The head of the Webspam team at Google. In that position he writes and speaks frequently about many SEO related topics and serves as the public face of Google to the SEO community. His blog is at www.mattcutts.com/blog/ (note: SEOcoaches received no compensation for that link).
According to his blog, Matt joined Google in 2000 and wrote the first version of SafeSearch. He has degrees in mathematics and computer science and a doctorate in Computer Graphics.