[csa]

So is it safe to assume that the NYT always refers to Jon Stewart as Jon Leibovitz? Mark Twain as Samuel Clemens?

Maybe one could make an argument for a stage name or pen name being different (and there are many of those), but could Scott Alexander not also be considered a pen name?

[HideousKojima]

Having worked in a tv newsroom before doing IT (so I could see all the reporters' real names), roughly 90% of the reporters used pseudonyms for their professional work. Not sure about the rate for print/internet media, but I'm sure it's still pretty high.