Guillaume de Posch, born in 1958, started his career at the international energy and services company Tractebel (1985 to 1990) and then joined the global management consulting firm McKinsey & Company (1990 to 1993).
Guillaume de Posch began working in the media industry at the Compagnie Luxembourgeoise de Télédiffusion (CLT) as assistant to the Managing Director (1993 to 1994) before becoming Head of CLT’s TV operations in French-speaking countries (1995 to 1997). From 1997 to 2003, he was Deputy General Manager and Programming Director of the French pay-TV company TPS, before joining the publicly listed ProSiebenSat1 Media AG in August 2003, first as Chief Operating Officer and then as Chairman of the Executive Board and CEO (2004 to 2008).
Guillaume de Posch was appointed Chief Operating Officer and member of the RTL Group Executive Committee on 1 January 2012.
With effect from 18 April 2012, Guillaume de Posch assumed the role of Co-CEO of RTL Group. In January 2018, Guillaume de Posch stepped down as Co-CEO of RTL Group. Since then, he has served as a non-executive member of RTL Group’s Board of Directors.
Guillaume de Posch has served as President of the ACT (Association of Commercial Television) in Europe since 2017.