Peter Edwards is director of the Singapore-ETH Centre for Global Environmental Sustainability. An ecologist by training, he obtained his Ph.D. degree from Cambridge University for a study on nutrient cycling in tropical rain forest. In 1993 he was appointed professor of plant ecology at the Swiss Federal Institute of Technology (ETH) in Zurich, where he also served as dean of the Department of Environmental Systems Science. Peter a strong interest in the application of science and technology for better policy and management. He was a member of the executive board of the Alliance for Global Sustainability, a research partnership between several leading universities. He continues his own research into the environmental benefits of urban greenery.