Eric Ries (@ericries) is the author of The Lean Startup, the NYT bestseller that became a playbook for a generation of founders. He's also the founder of the Long-Term Stock Exchange and has a new book out called Incorruptible: Why Good Companies Go Bad and How Great Companies Stay Great. In this episode of Main Function, Eric sat down with YC's @garrytan to talk about why so many founders lose control of the companies they build, and what they can do to stop it. 00:47 — The Professor's…