Denis Simonart currently serves as the Chief Operations & Finance Officer and CFO for GroupM Belgium, overseeing financial operations for multiple entities within the organization since July 2014. Prior to this role, Denis Simonart held various finance director positions at Nielsen Company from September 2003 to June 2014, focusing on financial business partnering, project implementation across Europe, and team management. Early career experience includes serving as a Senior Auditor at Ernst & Young, where duties involved financial controls, auditing processes, and team leadership. Denis Simonart holds a Post Degree in Financial Analysis from the Belgian Association of Financial Analysts and has completed multiple degrees at institutions including Université catholique de Louvain and UCLouvain Saint-Louis Bruxelles.