When people ask me how to interview someone for their radio show or podcast, I usually refer them to the This American Life comic book, Radio: An Illustrated Guide. There’s not a lot of how-to-interview content there, but what there is is excellent. It’s certainly the only guide I used.
Now, I’ll just refer people to this excellent guide by our own Podthinker, Colin Marshall. Colin hosts his own public radio show and podcast called The Marketplace of Ideas, and it just celebrated its 100th episode. I was on the show last year.