Fortune’s 40 Under 40: Jon Stein, 37

In 2010, when Stein was launching his New York City–based “robo-adviser” startup, plenty of grizzled banking veterans told him he would never reach $5 billion in assets under management. The warnings were “intimidating,” he says, but they didn’t stop him: Betterment now has almost $6 billion in AUM for its 175,000 customers, making it the largest startup in the wealth management industry. In January the 200-person company launched Betterment for Business to help companies manage their employees’ 401(k) plans.

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This article originally published September 22nd, 2016 on Fortune.