If you could work, collaborate and be mentored by anyone living, who would it be?

Just asked this over on Twitter, but think this is a cool thought for people in here too:

There are amazing people alive today. Sure, many of us would love to work under great minds like Jobs or Da Vinci, but we have people like that on the world right now who can fill their shoes.

Who do you look up to, who would you like to be your mentor?

I want to start things off: I would love to spend a week working under Phil Knight. I read his biography a while back, and just loved the way and creativity that he used to build one of the biggest brands alive today. Obviously I could have said Elon here, but why not mix it up :)