Prof. Wolffgang specializes in international trade and tax law. He is Head of the Department of Customs and Excise which forms part of the Institute of Tax Law at the University of Münster, Germany. He is also a co-shareholder of the affiliated AWA Foreign Trade Academy, where he specializes in customs and export control law.

A former member of the German customs administration and former fiscal advisor to Germany's Federal Fiscal Supreme Court, Prof. Dr. Wolffgang is a board member of Centre of International Trade Law at the University of Münster. He also is Editor-in-Chief of the AW Prax, a leading journal of external trade and customs law in German-speaking countries and the chairman of the EFA European Forum for External Trade, Excise and Customs.

Prof. Dr. Wolffgang has written extensively on international trade law, customs law and export controls in Europe. His areas of research include regional trade associations such as free trade zones and customs unions throughout the world. Prof. Dr. Wolffgang acts as an advisor to German and international enterprises concerning export and trade controls, international customs and other aspects of trade law and practice. In addition to his academic work, he has been the leader of expert teams providing technical assistance and capacity building to governments in Latvia, Lithuania, Macedonia, Palestine, Serbia, Southern and Eastern Africa and elsewhere in relation to customs and excise and other international trade issues.

Prof. Wolffgang is also Senior Advisor, Europe for the Trusted Trade Alliance; a co-shareholder and partner of the AWB Tax Consultancy Ltd., based in Münster, Germany and a senior advisor and consultant to MK Technology, export control consultancy services based in Washington D.C. In 2010 he co-founded the Wolffgang and Harksen Rechtsanwaltsgesellschaft mbH, which provides legal advice on international trade matters.