Someone whose name appears to be “Josh Fult” has set up an extremely anonymous-looking site called Improv Interviews that happens to have excellent long-form interviews with big names in the comedy world; the one with iO’s Charna Halpern is worth a read. 

(Handy hint: the monthly archive links don’t work, but if you change “rchive” to “archive” in the URL, you’ll get what you’re looking for.)