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David Ring is currently the Managing Director at Greenfield, where David specializes in investment, development, and delivery of sustainable and renewable infrastructure projects. David is also the Founder of Yoderlay and Co-Founder of Helix Marketplace, the UK's first frictionless energy marketplace. Previously, David was the Director at Zestec Asset Management and Founder of Solar Buyback Solutions Ltd. David also worked as the Director Energy at Just Energy Solutions and Project Development Manager at Carillion.