Bloomberg Opinion columnist Barry Ritholtz interviews Joe Ricketts, who founded the company now known as TD Ameritrade, a securities-industry leader that empowers investors with innovative tools and training. Since 2008, Ricketts has devoted himself to a variety of entrepreneurial ventures. He has also actively engaged in philanthropy through the Opportunity Education Foundation, the Cloisters on the Platte Foundation, the Ricketts Conservation Foundation and the Ricketts Art Foundation.