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Raphael Kübler has served as a director of our Company since April 30, 2013, and is a member of the Compensation Committee and Executive Committee of our Board of Directors. In January 2014, Mr. Kübler assumed the position of Senior Vice President of the Corporate Operating Office of Deutsche Telekom, our majority stockholder and a leading integrated telecommunications company, and reports directly to the Chief Executive Officer of Deutsche Telekom. From July 2009 to December 2013, Mr. Kübler served as a Senior Vice President Group Controlling at Deutsche Telekom. In this position, he was responsible for the financial planning, analysis and steering of the overall Deutsche Telekom Group as well as the financial management of central headquarters and shared services. From November 2003 to June 2009, Mr. Kübler served as Chief Financial Officer of T-Mobile Deutschland GmbH, the mobile operations of Deutsche Telekom in Germany now known as Telekom Deutschland GmbH (a wholly-owned subsidiary of Deutsche Telekom). Mr. Kübler also currently serves on the board of directors of Ströer SE & Co. KGaA and he has previously served on the board of directors of Hellenic Telecommunications Organization (OTE) from 2013 to 2018. Mr. Kübler studied Business Administration at H.E.C. in Paris and the Universities of Bonn and Cologne. He holds a doctoral degree from the University of Cologne.