Joseph Lewis is Head of Policy at the Institution of Environmental Sciences (the IES), the professional body for environmental scientists and the home of environmental expertise. Joseph leads the delivery of the IES Policy Programme, standing up for the voice of science, scientists, and the natural world in the conversations that matter. He also delivers the IES policy training programme.

Joseph has more than ten years of experience in public policy, including in Parliament and the charity sector. He was recognised on the ENDS Power List 2026 as "a prominent advocate for ensuring environmental science is reflected in public policy