CLB 2019 Proxy Statement

11 Continuing Class I Supervisory Directors (Term to Expire 2020) David M. Demshur Chief Executive Officer and Supervisory Director since our Initial Public Offering ("IPO") in 1995 Chairman of Supervisory Board since May 2001 Age: 63 Since joining our Company in 1979, Mr. Demshur has held various operating positions, including Manager of Geological Sciences from 1983 to 1987, Vice President of Europe,Africa and theMiddle East from1989 to 1991, Senior Vice President of Petroleum Services from 1991 to 1994, President from 1994 until January 31, 2018, and Chief Executive Officer from 1994 to the present time. Mr. Demshur's extensive background with the Company and the diversity of experiences gained while in these leadership roles positions him to be an effective leader of our Company. Mr. Demshur is a member of the Society of Petroleum Engineers, the American Association of Petroleum Geologists, the Petroleum Exploration Society of Great Britain and the Society of Core Analysts Section of the Society of Professional Well Loggers Association. Jan Willem Sodderland Supervisory Director since 2011 Member of Audit Committee and Lead Director Age: 77 Mr. Sodderland began his career as an attorney. He was a partner of NautaDutilh N.V. until 2006. In his practice, he built up considerable experience in assisting and advising companies in complicated takeovers, mergers and joint- ventures. His legal practice and service on boards of companies has given him broad, diversified exposure to best practices for corporate governance. Until recently, he served as chairman on the board of MUFG Bank (Europe) N.V. (previously known as Bank of Tokyo-Mitsubishi), which has its seat in Amsterdam. MUFG Bank (Europe) is part of Mitsubishi UFJ Financial Group, Inc., one of the world's largest and most diversified financial groups. Amongst others, he is also on the board of Pathé Theatres B.V. and Pathé Holding B.V. Pathé is a theatre company, active in France, the Netherlands, Switzerland and Belgium and is part of a group also engaged in film production and distribution. Until 2016 he was on the board of Du Pont de Nemours (Nederland) B.V., a manufacturer of specialty and industrial chemicals. Prior to his election to the Supervisory Board of the Company in 2011, Mr. Sodderland served as non- employee managing director and as non-employee director of other Dutch affiliates of the Company. Mr. Sodderland has served as our Lead Director since the 2017 annual meeting during sessions without Mr. Demshur.