 From 1998 to 2000, Mandil occupied the post of the Managing Director of Gaz de France, and then for several years was the Chairman and CEO of the "Institut Français du Pétrole" (French Institute of Petroleum).From 2003 to 2007 he was the Executive Director of the International Energy Agency.Since 2008, is a member of the Board of Directors of Total S.A. 
Mandil was also a board member of the SBC Energy Institute  and is director of Institut Veolia Environnement.