Gaëtan Zeyen Gaëtan Zeyen has been a lawyer for 20 years, specialising in European and international (OECD) taxation. He is a member of the Tax Institute (Liège) and Ph.D. Candidate in International Taxation. He is also an independent arbitrator. More by Gaëtan Zeyen European tax policy: focus on efficiency, not harmonisation! Blog 07 Dec 2017 Publications written or edited by Gaëtan Zeyen ✕