Before he got his own show, Dr. Phil was introduced to the mass US TV audience as a regular/repeat guest on Oprah Winfrey's show.

After several months of being ridiculed by David Letterman, Dr. Phil appeared on Letterman's show as a guest and was quite gracious, amusing, and self-depricating. He's been back several times since, and projects a very likeable personality.

Now he's making yet another fortune selling self-help books.