With a background in Chemistry, the first 10 years working at Shell’s Research Center in Amsterdam. Moved in 2001 to Staatsolie, started as a Process Engineer. Since 2005 involved from the initial design phases of Staatolie’s Refinery Expansion Project. From 2010-2014 working as a Project Manager in the Staatsolie Bio-ethanol project. After this project was put on hold, returned to the refinery as Technical Services Manager.

In March 2021, he took the role of Manager Sustainable Energy and leading the Local Content Development Taskforce, initiating various projects to develop local content. Since Q2 2023, Dennis joined the Offshore Directorate.