I've seen a couple of interviews with SJC and he always sounds very calm and thoughtful (and sometimes cute ;)); I really like him as a pianist and, as far as I've seen, as a person.

I think you might like the Langton book! As noted in other comments here, it's actually #3 in quite a long series (although the ones I really like are #1 through #3); if you have a chance to come across them, let me know what you think.