After studying criminal law at the University of Maastricht (2003), Serge Weening laid the foundation for his career in criminal law with Mr. Max Moszkowicz Sr. As the great master's last trainee lawyer, he learned the intricacies of the profession there. He gained several years of experience in a wide variety of criminal cases, after which he broadened his knowledge by attending the specialization course in criminal law (2010) at the Willem Pompe Institute for Criminal Law Sciences which is part of Utrecht University.

Over the years, he has served as criminal lawyer been involved in many major criminal cases throughout the Netherlands. He has extensive experience defending defendants in "murder cases" and he has special expertise in terms of terrorism.

Mr. Weening also has an affinity for real estate and corporate criminal law. He has regularly acted for entrepreneurs in fraud cases and officials suspected of corruption. Because he values legal depth, in 2018 he attended the Leergang Financial and Economic Criminal Law at the Free University of Amsterdam.

Mr. Weening shares his experience within the firm and has mentored several promising young criminal lawyers in recent years as a patron. In addition, he regularly provides courses and lectures to other criminal lawyers.