I’ve occasionally followed links to Newmark’s Door, and assumed the Craig Newmark there was the same guy behind Craigslist. But just now I noticed the tagline, “Things One Middle-Aged Economist Finds Interesting”, and thought to myself that Craig Newmark isn’t an economist and even if he had been at some time certainly wouldn’t present that as his identity now. Checking out wikipedia I see that The Craig Newmark has a different blog I’d never even heard of before. From now on I’ll try to remember these are two different people with the same name.