Mr. Bas A.S. van Leeuwen (LL.M., ESQ), attorney at law

Practice areas

Attorney BAS VAN LEEUWEN assists clients with criminal matters, administrative supervision and enforcement cases, and internal and external investigations. Cases involving accusations of fraud, bribery, money laundering, corruption or violations, financial mismanagement, of international sanctions seriously disrupt a client’s operations and damage their reputation. At a client’s request, Attorney BAS VAN LEEUWEN can conduct internal investigations, advice, litigate and negotiate with regulators and the Public Prosecution Service. Attorney BAS VAN LEEUWEN delivers swift solutions that address the underlying problems for urgent matters. Sometimes, Attorney BAS VAN LEEUWEN’s clients are injured by non-compliant conduct; sometimes they find themselves accused of the same.

Professional admissions and memberships

  • Nederlandse Orde van Advocaten
  • Stichting Opleiding Strafrecht Advocaten Midden-Nederland
  • Nederlandse Vereniging voor Informatietechnologie en Recht
  • Vereniging voor Familie en Jeugdrecht

Professional experience

  • Advocaat (2010-heden)
  • Forensisch Auditor (2006-heden)
  • Senior Inspector Forensic Fraud Auditing (2008-2010), Ultrascan Advanced Global Investigations
  • Security Consultant / Investigator (2006-2008), PINKERTON | Corporate Risk Management Services
  • Inspector Threat Information and Research (2006), Dutch Security Agency
  • Investigative Analyst / Forensic Auditor (2004-2006), 4iTrust Forensic Services and Investigations
  • Trainee (2003-2004), Politie Eenheid Midden-Nederland


  • Diploma Beroepsopleiding Advocatuur, Beroepsopleiding Advocatuur, 2010-2013
  • Master of Laws – LLM, Strafrecht / Strafrechtelijke Opleiding, Universiteit Utrecht, 1998-2003


  • De Nederlandse en Belgische particuliere recherchebranche – Invloed van de Europese communautaire rechtsorde, NJB (2006) Nr. 12, p. 698-701