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Claudia Beumer


C4Fuel BV

IBIA Board Member

Moderator - Session seven: Changing face of the bunker & shipping industry

After her degree as a Chemical Engineer and a number of years in industrial analytical measurements, Claudia switched to the maritime industry in 2011 with selling and developing the Certified Bunker Measurement Solution for Emerson, focusing on shipowners and barge operators for conventional fuels and LNG.

In those days, she was also a member of the first working group in SGMF, developing the guidelines for Quality and Quantity of LNG as fuel.

That interest in LNG brought her into her next job at Wärtsilä Gas Solutions, where she was commercially responsible for LNG Bunkering systems and biogas upgrading and liquefaction systems (bioLNG).

From September 2020 until the end of 2023, Claudia worked as a Global Account Manager for the VT Group; an independent, global barge operator providing high quality maritime logistics and bunkering services, where besides the global responsibility for the commercial activities of the VT Group, she was heavily involved in VT’s strategy to enable transport and bunkering of alternative fuels on behalf of their customers.

That passion for alternative fuels led her to establish her own consultancy and training company C4fuel, assisting stakeholders in the maritime industry in their journey to meeting the climate goals.

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Constantinos Capetanakis

Bunker Director

Star Bulk

IBIA Chair

Welcome Addresses 

Constantinos studied Law in Greece (LLB) and England (LLM in Maritime Law – University of Southampton). He is a qualified Greek lawyer since 1997 and English solicitor since 2002.

From 1998 to 2002 he was the Legal Counsel of Excel Maritime Carriers, a Piraeus-based shipping company listed in NYSE. From 2002 to 2004 Constantinos worked as a marine litigation solicitor at Holman Fenwick & Willan, both in London and Piraeus. Between 2004-2013 he was a shareholder and Director of Quantum Shipping Ltd., a shipping company of Constantinos’ family interests, where he was responsible for the company’s investment strategy as well as for all legal, commercial and managerial issues.

In 2014 Constantinos joined Starbulk, serving as General Manager of a number of private vessels and subsequently as Executive Vice President – Control Director of the group’s procurement arm, Ship Procurement Services SA. Since 2019 Constantinos is serving as Starbulk’s Bunker Director, responsible for bunkering procurement / strategy and Starbulk’s cooperation with bunker industry stakeholders.

In 2020, Constantinos first entered the elections for IBIA’s Board and was successfully elected as a Board Member. Currently, he holds the positions of IBIA Chair, Chair of IBIA’s Future Fuels Working Group, and previously served as IBIA’s Vice Chair from 2022 to 2024.

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Timothy Cosulich

CEO and Board Member

Fratelli Cosulich

IBIA Board Member

Session four: Shipowners and Buyers panel 

Timothy started his career as a Consultant at PricewaterhouseCoopers first in London and then in Madrid, in the Valuation & Strategy department, focusing on M&A transactions. He then got his MBA from INSEAD and later on joined the A.P. Moller Maersk Group in The Netherlands as a General Manager, focusing on New Terminals acquisition and development. In 2010 Timothy joined his family business, Fratelli Cosulich, where he sits on the Group Board of Directors and holds the role of CEO – Marine Fuels.

Fratelli Cosulich is a diversified Group founded in 1857, fully owned by the Cosulich family, now at its sixth generation. The Group is active in a number of aspects of the Shipping Industry, from ship-owning, to ship-agency, freight-forwarding, catering, manning, yacht-services, and marine fuel trading and supplying. Fratelli Cosulich has offices in 15 countries, approx. 1,000 employees worldwide and a yearly turnover of USD 1.9bn.


Alexander Prokopakis

Executive Director


Welcome Addresses 

Alexander is the Executive Director of IBIA. Under the direction of IBIA’s Chair and Board he is leading the Secretariat, heading all the activities of the organization and he is responsible for the overall management of the Association.

Alexander was the founder and CEO of PRO Holdings and the architect of the probunkers project. Prior to founding probunkers, he served Mamidakis Brothers Group as a senior executive, leading all of the Group’s Shipping, Bunkering and Aviation activities, through its respective companies: JetOil, JetTank and STYGA Compania Naviera. Mr. Prokopakis has over 25 years of professional experience in leadership positions, over which he has attained deep knowledge and expertise mainly in the industry of shipping and bunkering. He is a Graduate of St. John’s University with an MBA in Executive Management and holds a BSc Degree in Business Management from the State University of New York.

Constantinos Capetanakis
Timothy Cosulich
Alexander Prokopakis
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