Bryce DeWitt was a theorist that developed an early form of quantum gravity in an effort to bypass the infinite number of counterterms it seems to require, and, with John Wheeler, wrote down what amounts to the wave function of the universe. That said, a talk he gave entitled “Quantum Gravity, Yesterday and Today”, has appeared on arXiv:

http://arxiv.org/pdf/0805.2935v1

I think my favorite part of this article isn’t his remarkable role in the history of the development of a very difficult field, but rather his anecdote about Wolfgang Pauli:

I was hoping to spend some time as a postdoc at the ETH, so Pauli asked me what I was working on. I said I was trying to quantize the gravitational field. For many seconds he sat silent, alternately shaking and nodding his head (a nervous habit he had, affectionately known as die Paulibewegung). He finally said “That is a very important problem - but it will take someone really smart!”

That’s classic Pauli for you.