littlebabyjesus
one of Maxwell's demons
Second bit - possibly, yes.Depends what you're hiring him to do, I reckon.
If you're never going to ask him for free publication of stuff you might hire him regardless.
The fact he wrote the thing in the first places makes me think he's probably diversified a bit anyway.
First bit? If you're going to be difficult and stroppy in public, you'd better be the fucking best in your field. Otherwise, there are plenty of non-difficult, non-stroppy people looking for work.