Castel appoints Gert van Middelkoop as Head of Marine

5 June 2020

Castel appoints Gert van Middelkoop as Head of Marine  

5 June 2020 – Castel Underwriting Agencies Limited (Castel), the club-style MGA formation platform, has today announced the appointment of Gert van Middelkoop as head of its new Marine Centre of Excellence.

Van Middelkoop is responsible for the development and oversight for a marine book of business in the UK and continental Europe. The newly established Marine Centre of Excellence with teams in London and Rotterdam will focus on all classes of marine business including cargo, hull and liability.

He joins from Navigators where he was Head of Marine International Division overseeing all marine operations in Continental Europe, Asia and Latin America. He has held senior marine underwriting roles with AIG, CV Starr and Torus (now StarStone). His marine experience extends into surveying and claims with several years working as a marine surveyor and loss adjuster.  

Mark Birrell, Chief Executive of Castel, said: “Gert brings Castel an unrivalled track record and reputation in the marine insurance market. His experience and knowledge will be important as we build our presence in this market and take advantage of the opportunities offered by the prevailing conditions.”

Van Middelkoop commented: “Castel has a proven model that supports entrepreneurial underwriters to build profitable books of business. For the marine market, the current hardening of rates together with the withdrawal of some carriers and capacity creates the opportunity for a one stop marine shop which our new centre of excellence will be. Castel provides us with flexibility, strong capacity and backing to be able to respond to these opportunities.”

Further appointments to the Marine Centre of Excellence are expected to be announced in the coming months.


For further information, please contact:

Full Circle Communications
Alex Wise

Mobile +44 (0) 7710 665615
Tel:  +44 (0)20 7265 7887 

Notes to editors

Castel Underwriting Agencies Limited, part of Arch Insurance International, is an independent trading company and managing general agent (MGA) and club-style MGA formation platform focused on achieving success and driving innovation through collaboration. It provides experienced and entrepreneurial underwriters with stable capacity and a fast-track route to creating their own businesses. Castel is authorised and regulated by the Financial Conduct Authority. Learn more about Castel at

Castel’s underwriting cells include:

  • Specialty Centre of Excellence which supports talented and entrepreneurial individual underwriters who have smaller books of niche business including bloodstock risks, political risk, marine and global property facultative reinsurance.
  • Construction and Engineering Centre of Excellence which supports construction and Inherent defect insurance.
  • Warranty and Indemnity Centre of Excellence which supports Western European M&A transactions and tax risk insurance for liabilities in Europe.
  • Marine Centre of Excellence which supports marine cargo, hull and liability classes of business in the UK and continental Europe.
  • Medical & Commercial International (MCI) which underwrites general medical and pharmaceutical liability business on an international basis.
  • Nirvana Risk Partners which underwrites media, technology and cyber liability risks for small and large enterprises on a global basis.
  • Vecta Risk Partners which underwrites specialist group and individual accident & health, travel and lifestyle coverages distributed through brokers and affinity e-trading platforms.
  • Verve Risk Partners which underwrites U.S. professional and management liability risks, focusing on insurance companies and captives as well as insurance agents and brokers.
  • Yachtpod Risk Partners which underwrites specialist coverages including hull and machinery, increased value, war, medical expenses, mortgagee’s interest and loss of charter hire risks for superyacht owners, captains, and managers on a worldwide basis.
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