Founded a little over a decade ago, Robinhood Markets Inc. ((HOOD) broke into an industry filled with dominant, legacy players such as Charles Schwab ((SCHW) ), Interactive Brokers ((IBKR) ), and even JP Morgan Chase ((JPM) ). How did an obscure Menlo Park, California, start-up rise from obscurity to dominance? Founder and CEO Vladimir Tenev had a simple but revolutionary idea to disrupt a financial services industry ripe for disruption. Tenev needed a way to gain a foothold with young investors who had hea ...