With the news that Simon is leaving Microsoft Research (https://discourse.haskell.org/t/new-horizons-for-spj/3099), and now joining Epic Games (https://discourse.haskell.org/t/an-epic-future-for-spj/3573), we've taken the opportunity to sit down and do a retrospective of his time at Microsoft Research and the various collaborations that have come about as part of that journey. Special Guest: Simon Peyton-Jones.