John Mitchinson is the head of research for the British television panel game QI, and is also the managing director of Quite Interesting Limited. He is co-writer of the QI series of books with the show's creator John Lloyd. The two men are normally referred to as "The Two Johns" and are seen as the main controllers of QI, as they do most of the research of the show.
He is cofounder of Unbound, and along with Andy Miller presents Unbound's literature podcast Backlisted. For the ten years before QI, Mitchinson was a book publisher and editor, running the Harvill Press, Cassell & Co and acting as Deputy Publisher of the Orion Group.