Dennis makes up the Management Board, together with Dorothee van Vredenburch and Klaas de Vries.

Dennis is a member of the dispute resolution practice and the financial markets regulation practice. He has wide experience in litigation and arbitration in the financial sector. He represents banks and insurers in a wide range of disputes, including the defence against claims for alleged duty of care and misselling. He also represents financial institutions as claimant against other parties. Dennis leads the defence in a wide range of collective litigation matters from financial services, to consumer products, and climate change. He represented Ageas in the most recent court-approved collective settlement in the Netherlands.

Dennis is an expert on insurance law. He acts for corporate insureds in complex claims involving product liability, professional liability, D&O liability and fraud.