Madelyn Postman

I am an ESG Director at accountancy, auditing, and business advisory firm Menzies, having joined after the merger with Grain Sustainability in October 2025.

At Menzies, a Large B Corp, I support organisations with sustainability assessments, planning, and implementation with the aim to create a positive impact on people and the planet, while increasing stakeholder engagement and providing competitive advantage. A well-considered ESG approach can enhance top and bottom-line growth and create supply chain robustness while maintaining strong financial controls and performance.

As a B Corp Consultant, I support companies to certify and recertify as B Corps. I serve on the board of 1% for the Planet, through which businesses give 1% of revenue to environmental nonprofits. Further board positions are with Krystal EO and Fluo Technologies. Training really enthuses me, and I regularly deliver Carbon Literacy courses as well as the Climate Fresk, a 3-hour workshop to learn about climate science and galvanise action on climate change.

You can spot me as a frequent speaker on sustainability at industry events and I’ve appeared on BBC News half a dozen times.

I love living in green Metroland, at the other end of the Metropolitan Line from the Menzies London office, where I spend time with my family and pets. For most of the 1990s, I lived in Bologna and I speak fluent Italian.