In addition to the book version of the thesis, available through MIT Press, there's a scanned version of the ancient tech report online at ftp://publications.ai.mit.edu/ai-publications/pdf/AITR-450.pdf

Any links to his papers?

I couldn't find his PhD thesis - the best I could do was the mitpress site which contains selected chapters:

http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&...

Also, he has a list of selected older papers at his homepage:

http://www-2.cs.cmu.edu/~sef/sefPubs.htm