Robinhood's Brokerage Chief on Fighting the SEC's 'Nanny-Stating' and Harnessing the Power of 23 Million Investors

Plus, next week's events

Friday Q and A: With the army of young people it has drawn to investing, Robinhood Markets has garnered an outsized share of attention in Washington. That’s especially true at the SEC, where Chair Gary Gensler has championed big policy changes on market structure and brokers’ use of technology that could upend the firm’s business.

Robinhood has mounted a…