In Valve's New Employee Handbook released a few months ago there was a quip about how Valve struggled to hire disciplines well outside of its typical expertise. They specifically mentioned industrial designers as one of those disciplines. I guess people didn't pick up on it at the time.

Link: http://newcdn.flamehaus.com/Valve_Handbook_LowRes.pdf

*Economist was the other job they mentioned, which they filled with the famous Yanis Varoufakis.