Paul Krugman knows: he reads Alan's mail:
Economics and Politics: [W]hile the battery lasts: Alan is a fine choice as chief economic adviser. He’s done excellent work, he’s a really good guy, whom I know pretty well, since we keep getting each others’ mail. Now the question is whether anyone in the administration listens to him….
Alan may write about labor markets, but he knows macro and is pretty salt-water and activist by inclination, as far as I know. His advocacy of job tax credits comes from an attempt to work within political constraints, not lack of interest in more decisive solutions. And I think the administration was looking for a high-profile, first-rate economist willing to take the job, rather than tilting toward a particular field.
Also, the reason we get each others’ mail is that Princeton relies on the advanced mail-processing technology known as pigeon-holes, and our slots are next to each other in the Woodrow Wilson School set.