Mrs Maayke Maas-Cooymans > Ploum > Rotterdam, Netherlands > Lawyer Profile

PO BOX 711
Maayke Maas-Cooymans photo

Work Department

Administrative law
Environmental law


Attorney at law, partner


Maayke graduated from Utrecht University in 1997. She gained work experience during successive spells with Trenité Van Doorne, De Brauw Blackstone Westbroek and Simmons & Simmons, before joining Ploum as a lawyer and partner in 2008.


After graduating Maayke started working as an environmental lawyer. After she joined the partnership of Ploum in 2008, Maayke specialised in complex environmental law matters, with a special focus on external safety, hazardous substances/waste, energy (windfarms on- and offshore, solar energy farms, district heating) and climate/CO2 (capture storage). She acts on behalf of both governmental institutions and (the larger/multinational) commercial parties. Maayke’s practice focuses on both the legal and operational aspects of Seveso companies, in particular refineries, tank storage terminals and also of the chemical industry. She is a trusted sparring partner for the VOTOB and the VNPI. Maayke often lectures on environmental and Seveso topics, such as the PGS 29, major accident prevention policy, aging and enforcement actions.

Because of her expertise and vast experience, Maayke has been appointed as an administrative judge of the District court of Zeeland-West Brabant in 2015, where she handles complex environmental matters. In 2018, she was appointed as a member of the Council of the Rotterdam Bar Association and as a member of the supervisory board of the Purified Metal Company.


Maayke graduated from the University of Utrecht in 1997, majoring in Administrative (environmental) law and Civil law.

Lawyer Rankings

Netherlands > Environment and planning

Ploum’s environmental and planning department acts at the forefront of developments in the energy industry, including the energy transition, climate change and the nitrogen deposition crisis; it has recently been involved in carbon capture and storage (CCS) and (green and blue) hydrogen production projects. Practice head Maayke Maas-Cooymans acts as a compliance officer for BP, advising on environmental permits. The team is jointly headed by Alexandra Danopoulos, who was recently promoted to partner, and Stephan Sluiter.

Netherlands > Energy: transactional

Rotterdam-based Ploum is noted for its expertise in the oil and gas sector. It draws on strength from its public and environmental law, and commercial and corporate law experts, to provide advice on midstream and downstream activities. Its team also has experience of mandates in the upstream sphere. Stephan Sluijters has over 20 years of experience in energy transactions and continues to add renewables companies to his client roster. Maayke Maas-Cooymans handles public law matters for energy companies. Jeroen Terstegge is another name to note.