Rachel Bigby is an ESG and sustainability manager with Tetra Tech. She brings 12 years of experience as a corporate social responsibility professional working in sustainability and social impact across the private, public, and nonprofit sectors. As a program and project manager, she supports commercial and government clients to manage climate risks and opportunities to advance their sustainability maturity. She has extensive experience doing materiality assessments and stakeholder engagement, crafting ESG and social impact policies, and designing bespoke sustainability strategies and programs to aid clients in their unique sustainability journey. She earned her Master of Arts in Sustainable Development from the School for International Training and has certificates in Corporate Social Responsibility, Greenhouse Gas Accounting, and Permaculture Design.