Jeff talks with his former colleagues at StackExchange.Interview and Podcast
Some other Discourse related audio and video, if you are a glutton for punishment:
A very well received presentation at ForumCon, audio and video with slides side by side. Hard to explain, but I recommend this one, try the first 10 or 15 minutes and see if it grabs you:
Podcast with Ruby developers about Discourse. Not super technical, lots of background:
Podcast with the changelog, open source developer blog, about Discourse. Also not particularly technical.