You could've engaged him in a series of questions any time he has made himself available on Reddit, Google+ or in person when he has spoken and had Q$A sessions. It's your responsibility to seek out the answers to your questions.
Besides, it would be far more interesting for you if you posed the questions in person and spoke to him face to face to get a sense of him as an individual. I've found him to be unusually accessible as I've managed to speak with him on several occasions. Make an effort.