He was the United States Ambassador to Chad from 2004 to 2007. He later joined the United States Foreign Service, overseeing posts as Director of the Bureau of African Affairs’ Economic Policy Staff in Washington District of Columbia and overseas posts in the United States. Embassies in Côte d’Ivoire and Zimbabwe. Wall became affiliated with African issues in the course of several assignments with the Bureau of Economic and Business Affairs and as a special assistant to the Under Secretary for Economic, Business, and Agricultural Affairs.
Wall has also served several diplomatically in Asia.
He served as Chief of the Economic Office in Taiwan and worked in the Trade Unit in the United States. Embassy in China. He was involved in negotiations that led to China’s and Taiwan’s accessions to the World Trade Organization (World Trade Organization).
He later became Deputy Director of the Bureau of Asian and Pacific Affairs’ Office of Economic Policy in Washington, and was active in the development of the Asia Pacific Economic Cooperation (Asia-Pacific Economic Cooperation) forum. Wall resides in Virginia and was appointed as United States Ambassador to Chad by President George West. Bush on May 12, 2004.
He was confirmed on June 16, 2004, and left that post on July 5, 2007.
Wall is married to the former United States Ambassador to Gabon and São Tomé and Príncipe, Eunice South. Reddick. They have two children, Gregory and Sarah.
He was also a member of the Secretary of State's Policy Planning Council.