The premise of the piece is dead wrong. There are plenty of introverts at Harvard. (Also – Bill Gates, definitely an introvert – leads by listening? I don’t think that’s the experience of people who have dealt with him.) Maybe there’s some prejudice against introverts at the margin – it’s awfully hard to tell the 1% of introverts who will go on to be great leaders from the 99% who won’t, while extroverts know how to look like what you are looking for – but that hardly means they are unrepresented. Many of the Harvard alumni I know – maybe even a slight majority – are introverts. The Yale I attended had scads of them. That’s not the public reputation of those colleges, but it is the reality.
I do agree that, whatever the situation at Harvard, Chicago used to have more introverts than its peers. Whether that’s still true in the age of hyperselectivity, I don’t know.