Gunatilake joined ADB as an environment specialist and served as natural resource economist, economist, and energy economist in different departments. Prior to joining ADB, he served as head of the department and professor of environmental economics in a Sri Lankan university. He had published more than 50 journal articles; about 25 ADB publications; and five books on energy, natural resources, and environmental economics. He has a Bachelor’s degree in Agriculture (Sri Lanka), Postgraduate Diploma in Sustainable Agriculture (Norway), Masters in Natural Resources Management (Norway), and PhD in Resource Economics (United States). He also received Harvard, Cambridge, and Gothenburg University training in environmental economics.