A collection of David's interviews, reprinted with permission.
Part 1:
http://www.baen.com/podcast/mp3/Baen-Free-Radio-Hour-2014-04-18-Weber-Flint-Magic-3.mp3
Part 2:
http://www.baen.com/podcast/mp3/Baen-Free-Radio-Hour-2014-04-25-Weber-Flint-2-Magic-4.mp3