Sebastiaan advises clients on the full spectrum of export controls and economic sanctions issues and also assists clients on other compliance-related matters. Sebastiaan conducts internal investigations, prepares voluntary disclosures and frequently represents clients in regulatory enforcement actions with national and foreign competent authorities.

Clients highly regard Sebastiaan’s direct, clear and practical advice, as well as his sharp legal analyses, his result-driven approach and in-depth knowledge of their business. He has unrivalled experience the advanced technologies sector.

"Sebastiaan has exceptional knowledge of export controls and sanctions and has a great ability to break down the most complex legal challenges into a readily comprehensible advice."

Sebastiaan lectures on economic sanctions and export controls and is a regular speaker at (inter)national conferences and seminars about these and other compliance-related topics. In addition, Sebastiaan frequently publishes articles in legal magazines and is regularly quoted in various (inter)national media outlets. Sebastiaan serves as the Vice Chair of the Export Controls & Economic Sanctions Committee of the American Bar Association.

Sebastiaan regularly participates in discussions regarding sanctions and export control policy. In 2022 he was invited by the Dutch House of Representatives to address the Committee on Foreign Affairs on the application and enforcement of the EU Russia sanctions regime in the Netherlands. He is also regularly invited by various organisations to discuss the latest developments in the advanced technology sector in light of the current international geopolitical developments.

Sebastiaan is mentioned in Who’s Who Legal as Global Leader in Trade & Customs - International Sanctions and in 2022 and 2023 Sebastiaan was named the Lexology Client Choice Award Winner in Trade & Customs – International Sanctions.

Prior to founding Bennink Dunin-Wasowicz in 2024, Sebastiaan established and led during 10 years a leading independent firm specialising in international trade law based in Amsterdam.