My best friend and I took him on a ski trip when he had just sold Loopt. I've been connected to him since. He's always very responsive via texting and was stoked to receive copies of the book I wrote with AI when OpenAI gave me researcher access years ago. I haven't worked with him on a team however.

* the book was Autonomous Haiku Machine; and was the first book of haiku written by AI.

He worked with our group a bit in YC S16. He helped us rename our company to a better brand that targeted are demographic better. Was a pretty reasonable guy, soft spoken, logical, easy to work with and gives blunt advice.

I can guarantee you he is competent.