Bearded creator of VaporWare HeronLanguage and now CatLanguage?. He used to blog about Heron at http://www.artima.com/weblogs/index.jsp?blogger=cdiggins Since starting work at MicroSoft (March 2006?), he's been blogging about Cat. Heron seems to have fallen by the wayside.
He writes documentation at Microsoft and, as of August 2006, is not bearded:
http://static.flickr.com/62/207411429_8a1825a631.jpg?v=0
Diggins is the co-author of CppCookbook.