Jean-Yves Ollier is a Conseiller d'Etat. 

He has chaired the OECD's Economic Regulators Network (2017) and the Regulators' Club (2014-2017), and was Vice-Chairman of the Appeals Committee of the European Agency for the Cooperation of Energy Regulators (2016-2021).

An alumnus of the ENS and ENA, a graduate of Sciences Po and holder of a DEA in history, Jean-Yves Ollier worked at the Conseil d'État as a rapporteur on the judging panels from 1995 to 1997, then as deputy secretary general until 1999. At the same time, he was secretary general of the Commission pour la transparence financière de la vie politique. Appointed to France's Permanent Representation to the European Union in 1999, he was deputy head of the Economic and Trade Affairs Department until 2001. He then joined AXA's audit department. A member of the Paris Bar from 2004 to 2011, he was a partner in the international law firm Allen & Overy from 2007 to 2011. He was then Director General of the Commission de Régulation de l'Energie from 2011 to 2017. He is a member of the Second Chamber of the Administrative Jurisdiction Division of the Conseil d'Etat and a judge of summary proceedings. He is the co-author, with Godefroy Beauvallet, of a report to the government on the organisation of the regulation of digital platforms (2019).