Vierling has long been an environmentalist as well as an animal protector. He was active in board of the Reinwater foundation (an activist group for protecting the river
Rhine) until 11 July 1979, he was active as representative of
Milieudefensie to the
European Environmental Bureau in Brussels and he was president of the Ecological Movement in the Netherlands until 12 February 1983. He has been scientific collaborator at
Leiden University (International Environmental Law), the
Free University of Amsterdam (Nuclear Strategies) and UNISA,
University of Pretoria (Asian Studies). Also he has been Secretary of the Dutch Inter-Ministerial Commission for Migrants from
Suriname and the
Dutch Antilles before he became active in the anti-immigration Centre Party/Centre Democrats. On 12 October 1999 Vierling submitted a complaint against three members of the Dutch government regarding war crimes committed by it within the framework of NATO bombings on Yugoslavia at the
International Criminal Tribunal for the former Yugoslavia in
The Hague. In the July–September 2010 issue no 4 of
Ab Aeterno (Journal of the Academy of Social & Political Research) Vierling published an article about the Netherlands in world context entitled
The Netherlands, a Failed State in a Failed Continent. Vierling is openly gay and defends homosexuality. ==Gallery==