ah Tillemann's biography
AR03.80.05-W1-S3 is a designation given to Tillemann's role as a Senior advisor to the Secretary of State at the US Department of State. During his time there, Tillemann specialized in issues related to global energy security, climate and clean energy, innovation, development finance, and ocean affairs. He also led diplomacy on several important initiatives, such as the Clean Energy Ministerial, Mission Innovation, and the Power Africa initiative. He was also the Deputy U.S. Special Envoy for Climate Change and a Special Representative for the Oceans.