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Harke Jan started his career at Shell in The Hague and Houston, working on LNG projects progressing to business development roles in floating LNG at SBM Offshore in Monaco and Indonesia, and then to senior commercial roles at Heerema Marine Contractors, where he was Chief Commercial Officer since 2016. From 2017-2018, he was also President of the Board of the International Marine Contractors Association (IMCA).
In 2018, Harke Jan was appointed Chief Commercial Officer of Seaway7, responsible for strategy, business planning, business development and tendering activities worldwide. Harke holds a MSc degree in Offshore Engineering from Delft University of Technology and an MBA from the University of Texas.
Sebastiaan was appointed Finance Director of Seaway7 in 2023. He brings over 10 years of financial leadership experience across the offshore energy sector, having held senior roles at Seaway7 and Heerema Marine Contractors. With a strong foundation in corporate finance, accounting, commercial control, risk management, and business transformation, Sebastiaan plays a key role in driving financial strategy and performance across the business. He holds an International Executive Master of Finance and Control (Register Controller) from Maastricht University, an MSc in Finance & Investments, and a BSc in Business Administration from Erasmus University Rotterdam. He is also a Certified Management Accountant.