an interview from The Northern Soul in which Daniel discusses his role in What If, with thanks to them for sending the link. Then second there is The Dinner Party Download, episode 268 (also available as podcast via iTunes) where Daniel was the "guest of honor" and also discussed What If, plus he tells about the dining habits of blue whales, and why "television" was the "LOL" of the '30s.
Update: 7th January 2015. A photo I had missed back in 2014. There's also another episode from The Dinner Party Download, episode 221 from back in 2013 in which he talks about A Young Doctor's Notebook. Also available as podcast via iTunes.
picture source: AP