Derek Sietses > ENVIR Advocaten > Amsterdam, Netherlands > Lawyer Profile

ENVIR Advocaten
Jan van Goyenkade 10 III
1075 HP Amsterdam

Work Department

Environmental law, administrative law, governmental liability, including contract liability matters, nature conservation law


Derek Sietses joined ENVIR in 2019 as partner from Trip Advocaten. Derek specialises in public law (administrative enforcement, subsidies & regulations), environmental law (EHS-matters, protection of Natura 2000 areas & protected species) and governmental liability issues.

As a key contact for several government bodies (provinces, municipalities, water boards) and large national and multinational corporations, Derek advises and litigates in high profile and politically sensitive matters. He also represents multiple wind farm developers in injurious affection claim proceedings. Matters where administrative and civil law interlock, such as administrative law proceedings leading up to civil damages claims or contract negotiations between government bodies and developers are Derek’s strong suit.

Derek Sietses has published widely in leading Dutch legal journals and is the author of a book on governmental liability. His frequent courses for government bodies on a variety of legal matters are highly appreciated. Derek also teaches administrative law at Groningen University.


2019-today Partner at ENVIR Advocaten
2017-2019 Lawyer at TRIP Law
2013-2017 Lawyer at Stibbe Amsterdam


Dutch, English


2014-2015 Law Firm School
2012-2013 Master of Laws in Public Law and Civil Law, University of Groningen, Groningen
2009-2012 Bachelor of Laws, University of Groningen, Groningen