In the 4-person management team at the Netherlands foremost regional environmental agency Nienke manages the inspection and enforcement department with 250 staff. In an earlier capacity she was responsible for the development of risk analyses at the Netherlands Labour Authority. Her experience includes long term strategy development, as well as consultancy assignments and hands-on management during environmental crises in the Rotterdam harbour.

DCMR Environmental Protection Agency is the joint environmental agency of the Province of South Holland and thirteen municipalities in the Rotterdam area with 1.2 million inhabitants and close to 30.000 businesses, ranging from large-scale port activities, oil refineries and chemical plants to small scale service and transport companies.