He may be a bit of a curmudgeon - his blog is called Education Outrage, after all: http://educationoutrage.blogspot.com/

But he's done and continues to do a lot of good work. He helped found the Learning Sciences (an offshoot of cognitive science, AI, psychology, etc.) in the late 80s and early 90s. He continued and continues to do work in education, including founding experiential schools and writing books on education: http://www.amazon.com/s/?url=search-alias%3Daps&field-keywor...