We often think of disruption as this mythical struggle of David and Goliath — the scrappy start-ups rising out of nowhere to take down the established players, who are as powerful as they are out-of-touch.

In business, as in life, people tend to root for the Davids… and I’m not always sure why.

Today we’re turning our attention to the big guys, and taking notes from the leaders who broke rank to ignite the coup from within the castle walls.