Theo founded Fabrique with René and Jeroen, with which he turned his hobby (design and inventions) into his profession. With numerous patents to his name he has become an expert in designing. And gives back with his course 'Design and application of aluminium profiles', at the Aluminium Center.   

As a hobby he develops new scientific theories about Earth magnetic fields and the greenhouse effect. He is connected to the energy and climate discussion in the Netherlands and blogs regularly about this with his commonly used phrase: Do the math!.