John Todd was an American environmentalist and advocate for sustainable living. He is best known for his work in the field of ecological design and permaculture, promoting the idea of creating self-sustaining ecosystems. Todd founded the organization John Todd Ecological Design, which focuses on innovative solutions for environmental restoration and sustainable agriculture. In addition to his ecological work, Todd is recognized for developing living machines, which are systems that use natural processes to treat wastewater. His contributions have influenced various fields, including environmental science and sustainable architecture, making him a notable figure in the movement for a greener planet.