Bob Greifeld led Nasdaq as its CEO from 2003 to 2016, driving its evolution as a fledgling listing venue for many tiny tech companies into a diversified global financial technology company. He now sits on the board of two financial high frequency trading firms, including Virtu Financial, where he serves as Chairman. In this conversation, we discuss his new book, Market Movers, and dig into his storied career and examine some of the market structure debates shaping today's capital markets.