Lu Zhou occasionally communicated with some economics scholars during his time at Princeton, but he wasn't familiar with most of the economics department at Princeton.
It wasn't like he could remember everyone's name?
Not to mention, Princeton was a huge school, and since he only stayed there for a few years, it was likely that he never interacted with this person before.
Lu Zhou tried to remember if he had ever talked with this person, but he couldn't remember anything. Thus, he decided to go online and search for this person's academic background.
It turned out this guy was quite a big name.
Krugman!
2008 Nobel Prize in Economics laureate!
Expert in international trade, exchange rate, and macroeconomics!