JoAnn C. Stonier is a Mastercard Fellow for her expertise in data and AI, focusing on driving thought leadership and external engagement across academia and government and with regulators and other stakeholders, and acting as a trusted advisor across Mastercard in her subject matter expertise. 

JoAnn formerly served as Mastercard’s first chief data officer, leading enterprise-wide data strategy and management to ensure Mastercard maximizes the value of its information assets. Previously, JoAnn was the chief information governance & privacy officer for the organization. In that role she was responsible for worldwide privacy and information governance, leading those teams as well as leading regulatory engagement in this area. Prior to joining Mastercard in 2008, JoAnn was the chief privacy officer for American Express Company. She also held various roles of increasing responsibility at American Express, including chief operating officer, American Express Tax & Business Services; vice president, Acquisition Integration; and vice president and assistant to the chairman. JoAnn has worked at Waldenbooks, Inc., and PepsiCo and started her career as an auditor for PriceWaterhouse Coopers.

In addition to her work at Mastercard, JoAnn is an adjunct professor at Pratt Institute, where she teaches business strategy and international business in the Design Management master’s program.

JoAnn received her Juris Doctorate from St. John’s University in Queens, and her Bachelor of Science degree from St. Francis College. She holds memberships in the Bar of the State of New York and the Bar of the State of New Jersey. JoAnn has been recognized as a leader in data and privacy by several organizations, including the Aspen Institute, the United Nations, and the Information Governance Initiative, and has served on the board of the International Association of Privacy Professionals, the Center for Information Policy Leadership, and the Information Accountability Foundation. She is a well-regarded speaker at industry events and often addresses the need for balancing data innovation and privacy. JoAnn is based in Purchase, N.Y.