Let's say a recent math PhD in his early 30s realizes he's unlikely to land another postdoc after his current one ends, and he decides he really liked being a grad student and he really doesn't want to grow up and get a real job. He also really likes theoretical computer science and computational number theory. Do you think computer science PhD programs would be weirded out by the fact that he already has a PhD, or would it be an asset, or neither?