John is responsible for developing and communicating IEX's positions on market policy issues, engaging with governmental and regulatory authorities and liaising with pension owners and other asset owners. He also oversees IEX's membership in the national market system plans, including those concerning consolidated market data, the consolidated audit trail, and the Limit Up/Limit Down plans.

John joined IEX in 2014 from the SEC, where he led the Division of Trading and Markets, the group responsible for regulating broker-dealers and self-regulatory organizations. Previously, he led SEC efforts to implement significant elements of the Dodd-Frank Act. Prior to the SEC, he held senior positions at the Commodity Futures Trading Commission, the National Association of Securities Dealers (now FINRA), the law firm of Morgan Lewis & Bockius, and Citigroup Global Markets.

An expert in the regulation of securities professionals and securities markets, John serves as adjunct professor at Georgetown University Law School, is a member of the Markets Advisory Council of the Council of Institutional Investors and is a recipient of the Law and Policy Award at the SEC.

John earned his J.D. from the University of Michigan and a B.A. from the University of Texas at Austin.