Slack's CEO came out of a philosophy program.
> “Studying philosophy taught me two things,” says (Slack CEO Stewart) Butterfield. “I learned how to write really clearly. I learned how to follow an argument all the way down, which is invaluable in running meetings. And when I studied the history of science, I learned about the ways that everyone believes something is true–like the old notion of some kind of ether in the air propagating gravitational forces–until they realized that it wasn’t true.”
LinkedIn's CEO also shares some lessons that philosophy taught him. See Probabilistic vs. Deterministic Thought