Of all the public figures and media personalities, very few actually change the way you live for the better, but Dennis Prager is certainly one of them. Through PragerU, The Dennis Prager Show, his Fireside Chats and writings like The Rational Bible, Dennis Prager has literally reached billions and touched the lives of millions around the world. So who is Dennis Prager, and why is his career ascending at 70 years old? Allen Estrin, Producer of The Dennis Prager Show and Co-Founder of PragerU, explains.