Robert GreifeldRobert Greifeld is former CEO and Chairman of the NASDAQ OMX Group. He is currently the Chairman of Virtu Financial, a high-frequency trading firm. Greifeld is a member of the Business Roundtable, the Financial Services Roundtable, and the Partnershi for New York City, an organization devoted to enhancing the local economy. He is also chairman of the USA Track & Field Foundation, which supports emerging athletes and youth athletics. Read More Read Less