Does body double spell double trouble for Dr. Jarvik?

From the New York Times article:

Dr. Robert Jarvik is best known for the artificial heart he pioneered more than a quarter-century ago. Since then he had toiled in relative obscurity — until he began appearing in television ads two years ago for the Pfizer cholesteral drug Lipitor.
...
Some of the questions may involve his credentials. Even though Dr. Jarvik holds a medical degree, for example, he is not a cardiologist and is not licensed to practice medicine. So what, critics ask, qualifies him to recommend Lipitor on television — even if, as he says in some of the ads, he takes the drug himself?

And, for that matter, what qualifies him to pose as a rowing enthusiast? As it turns out, Dr. Jarvik, 61, does not actually practice the sport. The ad agency hired a stunt double for the sculling scenes.

Click here to access.