Prof. Dr.-Ing. Sigram Schindler, Co-CEO

Prof. Dr.-Ing. Sigram Schindler founded the TELES GmbH in 1983, and afterwards was its sole owner and general manager. He has served as its CEO since the company was changed into a corporation. From the early 1970s he was a Professor of Operations and Communications at the Technical University in Berlin and has been Professor Emeritus since turning 65.

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Oliver Olbrich, Co-CEO

Oliver Olbrich was appointed to the TELES AG management board in January 2011. He has worked in the telecommunications sector since 1980 and began his career at Deutsche Telekom. From 1990 to 2000, he gained significant experience while working at Siemens in various positions and cultural environments. Following further positions at Level3, Tiscali and British Telecom, Oliver Olbrich joined TELES AG in 2008 and assumed responsibility for service, technical sales, North American operations and global sales. Mid 2011, he also assumed responsibility as CFO. In July 2015 he has been appointed as Co-Chief Executive Officer.


Thomas Haydn, COO

Thomas Haydn was appointed to the board of TELES AG in July 2016. He was Head of Development for Voice over IP and Multimedia Solutions at Kapsch AG in Vienna, Austria, from 1998 to 2006, when he joined TELES AG. Initially responsible for product marketing and management, he  took charge of the Enterprise Solutions business unit in 2011. He has been responsible for the complete product portfolio (Core Solutions) since 2015.