Gianne Middleton

Chief of Staff

Gianne Middleton is a clean fuels and strategy expert with global experience across hydrogen, green ammonia and methanol. Formerly with PIF and NEOM, she led market intelligence, partnerships, and policy strategy across Europe, the Middle East, and Asia.

At MarineFifty, she drives decarbonization strategy, partnerships, and communications outreach to scale next-gen maritime fuels.

Partners

Krishnan Narayanan

Partner

A serial entrepreneur with extensive experience in alternative investments, sustainability and new technology. He was previously a partner and regional leader at PwC Strategy&.

Marco van der Sanden

Partner

Marco combines decades of executive leadership in the petrochemicals sector with a proven track record in corporate sustainability. He previously led Corporate Sustainability Business Development at SABIC.

Ralph de Haan

Partner

A recognised leader in the global hydrogen economy, with sharp commercial insight, deep technical knowledge and a track record of delivering transformative green fuels projects in Europe and the Middle East.

Jakob Stampe

Partner

A global energy executive with a 25-year track record in LNG, shipping, and energy transition leadership. He has deep sector knowledge and international experience in clean maritime infrastructure and decarbonisation.

Jonny Lewis

Partner

A global investment executive with a 20-year career in equity and debt investing, growth capital, capital raising, and corporate finance, across six continents. He was previously the CIO at Olympia Capital Partners and Managing Director at the Clermont Group.

Mani Sarathy

Expert Partner

A highly experienced chemical engineer and energy systems expert dedicated to advancing clean fuels and maritime decarbonization, blending deep technical expertise with global research, policy, and industry collaboration.

Wider Team

Paul Miles

Investment Principal

Extensive experience in financial modelling, due diligence and investment strategies. Former Director at PwC and a renewable technology strategist.

Mark Carter

Senior Analyst

Former KPMG Advisory, Mark is a research and investment analyst with a particular passion for decarbonization and the energy transition.

Geoff de Groot

Senior Consultant

Extensive experience in growth strategies and due diligence with a focus on cleantech businesses. Former Senior Associate at Strategy&.