Date of Birth: 
About John Cannell
- John Jacob Cannell, M.D.
- (born June 21, 1948, Washington, D.C.) is an American doctor.
- An anti-smoking activist, Cannell was featured in the New York Times in the 1980s for turning away smokers from his clinic in West Virginia.
- Cannell founded a nonprofit group to address perceived problems with educational testing.
- Cannell has described several hypotheses regarding the health benefits of Vitamin D and is the founder of the Vitamin D Council.
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