Piell succeeds E. Beth Keeve who is retiring following 13 years of service to the company. Julie Holzrichter, who in July assumed the role of Managing Director, Operations, also joins the Management Team effective today. She will continue to report to Bryan T. Durkin, Managing Director and Chief Operating Officer.

As Managing Director and Chief Organizational Development Officer, Piell will be responsible for helping CME Group strategically attract, retain and develop talented employees to achieve its business goals. She will have oversight for benefits, compensation, employee relations, organizational effectiveness, professional development and recruiting functions. In addition, Piell will be charged with working closely with the CME Group Management Team to ensure that the company is developing the full talents of its employees in ways that promote value creation for CME shareholders. She will report to CME Group CEO Craig S. Donohue.

"Hilda has been an extremely valuable member of our team for the last seven years, and her approach to working cross-functionally, creating strategic solutions and delivering great results will serve her well in Organizational Development," said Donohue. "Under Hilda's leadership, we are confident that we will continue to attract and develop the talented team that sets us apart, as well as grow as a great place to work."

Piell, 39, joined the company in 2000 as Associate Director & Assistant General Counsel and has held positions of increasing responsibility in the Legal Department since that time. She most recently served as Managing Director & Senior Associate General Counsel and played key roles in the negotiation and completion of several important strategic initiatives including FXMarketSpace, Swapstream and Liquidity Direct. Piell also led significant integration planning efforts during the CME/CBOT merger.

Prior to joining CME Group, Piell served as Associate Commercial Counsel for MCI Worldcom, Inc. She also worked for Jenner and Block and as a law clerk for the Honorable Ruben Castillo in the U.S. District Court in Chicago. She earned a bachelor's degree in political science with high distinction from the University of Michigan and a JD degree, cum laude, from the University of Michigan Law School.

Holzrichter, 39, has been with the company for 18 years and most recently served as Managing Director, CME Globex Services & Technology Integration where she had primary oversight for the GCC, CME Globex connectivity services and certification environments and quality assurance, as well as trading floor technology. She attended DePaul University and the University of Illinois at Chicago.