We caught up with Jon Stein, the Founder and CEO of Betterment, Inc., in his New York office this summer. Jon launched Betterment to offer average investors access to first-rate, affordable financial advice. He talks about why he's okay with his team members bringing their kids to work, why books are important to him, who he admires in the financial world. and why being a trusted fiduciary advisor is his firm's purpose first and foremost.