Debbie Allen - Grey's Anatomy
Debbie Allen has a long list of director credits, some in which she played a role like Everybody Hates Chris. She started directing episodes of Grey's Anatomy before she even started her role as Dr. Catherine Avery. She loved the show so much; she decided to join in too.
Jensen Ackles - Supernatural
Fighting supernatural beings isn't Jensen Ackles only talent. He works on both sides of the camera on Supernatural. Ackles has directed five of the episodes he's played a role in as Dean Winchester.
Bryan Cranston - Breaking Bad
You probably recognize Bryan Cranston as Walter White on Breaking Bad, but before that, he was Malcolm's dad on Malcolm in the Middle. Cranston directed episodes for both of these shows while playing a role. Most recently he stepped into another show to direct but doesn't act in -- Modern Family.
David Schwimmer - Friends
David Schwimmer has a lot of acting credits to his name, 54 to be exact, but he's well known as Paleontologist Ross Geller on Friends. While playing Ross for ten years, he also directed ten episodes. Schwimmer went on to direct a few more TV shows and a couple of movies.
Peter Krause - Parenthood
Peter Krause is well-known as the straight-laced dad, brother, and son on Parenthood. While he was in that role, he sat in the director's chair and pulled off two episodes in 2012 and 2013. He wasn't the only Braverman man to direct in Parenthood because Crosby (Dax Shepard) tries his hand in directing too.
Robin Wright - House of Cards
Robin Wright said she caught the directing bug while playing Claire Underwood on House of Cards. She directed one episode and loved it so much that she said she might do more directing than acting in the future.