I've read the bio as well... it's quite patchy, but covers the main bases and not very deep. Perhaps the author felt uncomfortable prying too much. There are copies at Amazon USA and via abebooks.com
He (Al Stewart, not Judd) has a good way with a line:
"Money has its favourites, and yours went back to them"
(from Old Compton Street Blues)
Oh I have no need of a chart or creed
You told your waiting crew
For the winds of chance they will bear us straight
And you spoke as though you knew.
So you paid no mind to the warning signs
As you gave your words so free
Don't change your tack when the timbers crack
On the dark and the rolling sea
(from The Dark and the Rolling Sea).