Oz is a frequent contributor to Esquire Magazine and also appears regularly on television shows such as "Oprah" and the "Today Show". A search for his name just on the Esquire website gives 63 different articles he has either written or contributed to, one of which is an "in-depth plan for better health" from the May 2008 issue. Additionally, Oz was included here on Time Magazine's list of the "100 Most Influential People of 2008".
Weil is the founder of the Arizona Center for Integrative Medicine at the University of Arizona... which takes a whole body approach to medical care that focuses heavily on prevention through healthy living. He's also written extensively (as his wikipedia page illustrates) and been featured twice on the cover of Time Magazine.