The Large, the Small and the Human Mind by Roger Penrose is an excellent and accessible introduction to his own theories of quantum physics and its implications for the concept of mind. Drawing heavily on his other books, it also includes criticisms from Hawking and others, as well as Penrose’s responses to their points.
Definitely recommended if you haven’t read Penrose before; also recommended if you’re not sure what the criticisms of his work might be. If you’ve read Shadows of the Mind and/or The Emperor’s New Mind – especially the former – then the chances are that you’ll already know a lot of the stuff in there. Having said that, it’s still an excellent book. And being so small, it’s not too daunting, even for those to whom quantum physics seems entirely alien.