Gertjan specialises in complex commercial litigation. In legal proceedings, he represents a range of both national and international clients from financial institutions to leading businesses.
His practice involves a broad range of civil liability issues, including disputes about various types of contracts, tort litigation – frequently with a substantial technological element – professional liability disputes, and banking and securities litigation.
Gertjan is also an insolvency expert and litigates about issues such as the validation of claims, fraudulent preference and director's liability.
Gertjan has written numerous articles and case comments on insolvency and civil law issues. He also lectures at several academies for post-graduate education on civil law and insolvency law.
In 1997 he obtained a PhD from the University of Nijmegen for a doctoral thesis on the settlement of the bankruptcy estate.