Commencing 2020, Gerjan has been a contracted consultant for ECW-energy, also in the Netherlands, as and when his services are required
Currently, Gerjan Hazelaar is a contracted consultant for HVC geothermal energy, the Netherlands
Since 2020, Gerjan Hazelaar has been a contracted consultant for Noubian industrial chemicals in the Netherlands
Contracted Consultant for Petrogas E&P, Dana Petroleum & Taqa Energy in The Netherlands, West Africa, United Kingdom & Denmark
