We are an independent advisory firm specializing in sustainability, carbon markets, and corporate strategy. Our mission is to help organizations navigate the energy transition with clarity, confidence, and impact. With global experience across industries, from financial services and manufacturing to consumer goods and energy, we design strategies that are both ambitious and pragmatic.

Our approach is rooted in rigorous analysis and practical execution. We guide clients through complex regulatory landscapes, support high-stakes investment and M&A decisions, and craft decarbonization roadmaps that align with business growth. Whether working with Fortune 100 corporations, investors, or mission-driven organizations, we deliver solutions that integrate sustainability into the core of business strategy.

GBB Strategy

Tyler brings nearly 20 years of consulting and leadership experience at the intersection of strategy, sustainability, and global development. As a former Director at ENGIE Impact, he helped build the firm’s carbon markets and decarbonization practices from the ground up. Earlier in his career at EY-Parthenon, he advised on multi-billion-dollar mergers and divestitures for leading financial institutions.

Beyond the boardroom, he's worked in diverse contexts globally, collaborating with governments, NGOs, and community organizations to advance economic development and climate resilience.  This combination of experience allows him to understand both the financial imperatives of global corporations and the human realities of sustainability challenges.

Tyler's academic background includes an MBA from Duke University, a BA in Political Economy & Japanese from U.C Berkeley, and a post-graduate certificate in Sustainability from Harvard. 

Tyler Marcus