Werbach is regarded as one of the world's premier experts in sustainability. At age 23, he was elected as the youngest president ever of the Sierra Club, the oldest and largest environmental organization in the United States . In 1998, he founded sustainability agency, Act Now, to engage the corporate and media world in social, environmental, cultural and economic change. After ten successful years, Act Now merged with global ideas company Saatchi & Saatchi to form Saatchi & Saatchi S, the world’s largest sustainability agency. Werbach serves on the Advisory Board for the National Academy of Sciences, Climate Change Communications.