All entrepreneurs dream of building a product that can improve the world in some way. Few take on the challenge of disrupting an industry rife with regulations and unreceptive to change. But that’s exactly what the founders of Wealthfront set out to do. Fast-forward to today: Wealthfront manages over $4.6 billion dollars from nearly 100,000 users. They have raised $129 million in capital and forged a new class of “robo-advisors,” attracting much industry buzz and concern from major financial institutions. Here's a look at some of the growth tactics they used.