Reddit mentions of Change Your Voice : Change Your Life : A Quick, Simple Plan for Finding & Using Your Natural Dynamic Voice

Highly recommend reading Change Your Voice, Change your Life. I read it 11 years ago after I failed a job interview and felt like it was 90% how I said things not really what I said. It was key for finding my "natural" voice and has exercises that I repeat from time to time. It is a little heavy on the excessive anecdotes but I found it to be super valuable.

A doctor wrote a book about proper voice technique that i've read and am reading again that's pretty insightful. dr morton cooper

I think a book like this would have a lot of the same information as my friend was studying. The reviews seem pretty positive on the book, I'd say its worth checking out.

Found some extra items to add to his list:

1. A book to help him use his biological voice instead of the chain-smoking Kermit the Frog voice he uses: http://www.amazon.com/Change-Your-Voice-Finding-Natural/dp/0879804416
   
   (That Thanksgiving podcast where he skyped in and you could barely hear him was the best one yet - he didn't dominate the conversation with his droning monotone microphone-swallowing voice that happens on the rest of the podcasts.
   
   
2. This next Amazon item would help Alex to stop making terrible jokes like "that's a thing" or others where he basically reduces creativity into a Jon Lovitz-style "It Stinks!" soundbyte which sounds hilarious to only him. http://www.amazon.com/Complaint-Free-World-Complaining-Enjoying/dp/0770436390
   
   Edit: Downvote away, I'm not joking. Alex ruins podcasts with his affected voice and endless pursuit of negativity. As Giant Bomb transitions into a source of entertainment from a source of information, these two books would help him with two areas where he detracts from entertainment. Take solace, Alex: In the words of the Beatles, it's a fool who plays it cool while making his world a little smaller. Rejecting 99% of everything doesn't make you more interesting.