He's a great acoustic player / songwriter / & singer. You shouldn't have any trouble finding a plethra of information on him on the web, his fans are very devoted. I know he does use a capo sometimes and just about every song contains about 20 chords.
I saw him in concert in the late eighties playing at a college auditorium (probably held 6-8,000). One of the best live acts I've ever seen, he must've done 6 encores that night, that just keep going nuts.