Mr. Dennis Hesseling is currently heading Gas, Coal & Power Division of International Energy Agency (IEA) since April 2023.

Mr. Hesseling joined the EU Agency for the Cooperation of Energy Regulators ACER as Head of the Gas Department in December 2012. There he was responsible for the Agency’s gas activities. Before joining ACER, Mr. Hesseling worked as Head of Unit in the Competition Department of the Netherland Competition Authority NMa (ACM), responsible for merger control and antitrust enforcement in the Dutch energy, telecommunications and media sectors. Prior to that, he worked in the NMa’s Energy Regulation department from 2002 on, mainly on gas issues. From 2000 he worked as a management consultant for McKinsey & Company in Brussels, providing strategic and operational advice to postal companies and banks. Mr. Hesseling holds a PhD in Mathematics from Utrecht University, the Netherlands. Bulgaria, the Ukraine, Turkey and Vietnam, and political parties in various African countries.