Rifkin has taught at the Wharton School executive education program at the University of Pennsylvania since 1995, where he instructs CEOs and senior management on making a transition of their business operations into sustainable economies. Rifkin is ranked number 123 in the "WorldPost" / "The Huffington Post" 2015 global survey of "The World's Most Influential Voices". He also is listed among the top ten most influential economic thinkers in the survey. Rifkin has lectured before many "Fortune" 500 companies, and hundreds of governments, civil society organizations, and universities over the past thirty five years.