Taking his turn behind the camera.
"It was great, but it was very nerve-wracking. I worked very hard to be as prepared as I could be. I think it's very tiring being a director. I suddenly appreciate how good actors have it. They get to come in and say their lines and go home early. The director is there all the time, making all the decisions, preparing everything ahead of time, and then tying it all together. So it's hard work, but it's a thing I've always wanted to do and it didn't let me down. I found the process fascinating and I feel very proud to have managed to achieve that."
His co-stars were well-behaved.
"Nobody gave me a hard time. Everybody in the cast was so supportive and brought their A-game. I think they all kind of realized that I was terrified. It's scary to take on a whole new job with all the pressure on you."
What's in store for this week's episode.
"It's basically three main stories. It takes place on the day of Derek's first day of his clinical trial for Alzheimer's, which is obviously very important to him. He takes Alex Karev on as his assistant, much to Meredith's annoyance. Also, Bailey is becoming a rising Twitter star. She and the Chief lock horns on that because the Chief doesn't really know much about the world of Twitter. So that's a lot of fun. And Callie and Arizona continue to have a complicated situation with Mark and the baby and it really plays out in a funny, emotional way. Callie doesn't really know where she stands or anybody stands on this and she becomes very anxious and drives her OB doctor around the bend during the episode. So it's a very diverse, fun, and kind of dramatic episode."
The upcoming, highly-anticipated musical episode.
"It's gonna be from Callie Torres' point of view. It's going to be very dramatic, very high stakes, and it's going to be a lot of fun. We're in the middle of recording our songs now for the final track. We're going to finish that this week and start rehearsing and shooting in the next few weeks. It really is kind of a love letter to the fans. It's going to be a really emotional episode. I think it's a great experiment and I'm excited to see how it turns out."
Who has the best voice?
"Oh, me of course! I'm joking. Chandra Wilson has an amazing voice. Chyler Leigh has a beautiful voice, and I hear that Justin Chambers has a great voice. There's a lot of people with hidden talents on the show."
What's in store for Owen and Christina?
"I think they're going to hit a few walls. Owen's been very supportive of her this last half of the season, as he should be. He was kind of flaky in season six and didn't know who he loved and now he's showing that he's her rock. Now that she's well, they've got time to really look into what they want for their marriage and their future and they may have some major disagreements. So there's going to be some real bumps in the road for them. But I think Christina and Owen operate best when they have some angst going on, so hopefully it will make their bond deeper."