Ray Hollowell brings decades of experience building global partnerships for environmental initiatives. As founder of Sea Inspiration, he has worked across continents to connect governments, NGOs, communities, and industry leaders in advancing sustainability and regenerative practices. At GMT, Ray leverages his international network and deep understanding of conservation to foster collaborations that drive large-scale impact—from ocean and waterway protection to innovative recycling and circular economy projects. His role bridges cultures, unites stakeholders, and champions actionable solutions for a healthier planet.

Tjakko Dijk is a seasoned sustainable urbanist with over two decades of experience shaping climate-resilient, human-centered cities across Europe, Australia, and Southeast Asia. As founder of UrbanSphere Solutions and co-founder of The Watertaxi Company, he specializes in connecting governments, NGOs, and private sector partners to deliver innovative, sustainable mobility and urban development solutions. At GMT, Tjakko applies his expertise in strategic planning, stakeholder engagement, and environmental policy to advance projects that integrate regenerative infrastructure with community needs, ensuring impact that is both global in vision and locally grounded.

Mary Crowley is a pioneering leader in large-scale marine debris removal and ocean conservation. As Founder and Executive Director of Ocean Voyages Institute, she has orchestrated record-breaking cleanups, removing hundreds of thousands of pounds of plastics and abandoned fishing gear from the North Pacific. With decades of maritime leadership, scientific collaboration, and global advocacy, Mary brings to GMT a proven ability to unite international partners, deploy innovative cleanup strategies, and drive impactful environmental results. Her expertise directly supports GMT’s mission to combat plastic pollution and advance regenerative infrastructure worldwide.