Whatever happened to Dr. Robert Jarvik, the guy who invented the first succesfull, implantable artificial heart?

He's doing TV commercials for Lipitor, the cholesterol drug. You may have seen them. He talks to the camera, and then there's a long shot of him rowing a boat on Lake Cresent, showing how healthy he is on Lipitor.

Only it's not him rowing. It's a body double, Dennis Williams.

Dennis isn't even a doctor, but he plays one on TV.