Our Team

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Mark Prins

Director Fleet & Operations
Mark Prins (1975) started his career on sea as an engineer with Spliethoff before he continued his career with Jumbo Shipping. After 13 years at sea, he continued ashore and held various managerial positions at Wagenborg Shipping and Wagenborg Offshore before joining Abis Shipping as director Fleet and Operations.
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Ronald Dalebout

Director Finance & Control
Ronald Dalebout (1974) started his career as Certified Public Accountant at Deloitte. As part of the ‘shipping team’ he gained quite some experience within this sector. After 13 years he moved to the other side of the table in the role of CFO of Abis Shipping.
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Ronald Oldenburger

Superintendent
Ronald Oldenburger was born in the summer of "69". He has been sailing for several years in various ranks. In 1998 he started to work as Technical Superintendent. In 2016 he started to work for Thorco shipping where he was also responsible for the qhse department. Today I combine all these experiences at Gronberg Ship management.
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Marjanne van Harskamp

Company/Operational Assistant
Marjanne van Harskamp started her career in 2003 at Reider Shipping as assistant of a Superintendent. After 10 year at Reider Shipping she worked a short time as Crew Coordinator at Siem Offshore. She jointed Thorco Shipmanagement in August of 2013 as Assistant QHSE and Technical Department and after that she worked for Briese Shipping as Team Assistant before starting work as Company/Operational Assistant at Gronberg Shipmanagement.
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Patricia de Vries

Crewing Manager
Patricia de Vries started working for Feederlines in 2011 as a Crew Coordinator. In 2015 she fulfilled the position of Manager Crewing in the same company. The company Feederlines became Shipping Company Groningen at the end of 2017. At the 1st of September 2018 she started working for Gronberg Ship Management as Crew Manager.
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Agnes Klaver

Crewing coordinator
Agnes Klaver started her career as crew coordinator with Feederlines. At the end of 2017 Feederlines merged with 2 other companies formed Shipping Company Groningen. After 19 years working for these companies she took the step to join Gronberg Ship Management at the 1st of September 2018.
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Larissa Bleker

Financial assistant
Larissa Bleker started working for Seatrade Groningen in 2008 at the accounting department as a data entry employee and switched position in 2013 to continue as an assistant team leader. As of the 1st of November 2018 Larissa fulfills the position of Financial assistant at Gronberg Ship management.