Adam Werbach is the Chairman of Saatchi & Saatchi S and the Chief Sustainability Officer of Saatchi & Saatchi. He’s the author of Strategy for Sustainability, published by Harvard Business Press.

At Saatchi & Saatchi, Werbach guides global sustainability work from wind turbines to hybrid cars. A lifelong activist, at age 23 Werbach was elected the youngest-ever President of the Sierra Club, the oldest and largest environmental organization in the United States. He has worked with many of the world’s largest companies, including his controversial work to help Walmart launch its sustainability efforts.

Twice elected to the International Board of Greenpeace, Werbach is a frequent commentator on sustainable business, appearing on networks including BBC, NPR, and CNN, and shows ranging from the The O’Reilly Factor to Charlie Rose. He twitters at @adamwerbach.