Obtained a doctoral degree in mathematics from the University of Vienna.
Born in 1949.
He has been a member of the Board of Directors of Sistema PJSFC since 2017.
А member of Strategy Committee; Audit, Finance and Risks Committee and Nomination, Remuneration and Corporate Governance Committee and Investor Relations and Dividend Policy Committee of Sistema Board of Directors.
Mr Sommer is very active in the area of corporate governance, he is chairman of the Supervisory Board of VF Ukraine and member of the Board of Directors of Tata Consultancy Services, India.
Managing director, German branch, Sony Group.
The Chairman of the Management Board, Sony Deutschland.
Was the President and CEO, Sony Corporation USA, since 1993 — Sony Europe.
Chairman of the Management Board, Deutsche Telekom AG.
Member of the Board of Directors, Motorola Inc., USA.
A member of the Board of Directors (independent director) of Sistema, the Chairman of the Investor Relations Committee of the Board.
First vice president, Head of the Telecom Assets Business Unit of Sistema.
Сhairman of the Board of Directors of MTS PJSC.