William Andreas Brown served as the U.S. Embassy's last mission Chief to the Republic of China; but after diplomatic ties between Taipei and Washington severed, he remained on the island to set up the Taipei Main Office of the American Institute in Taiwan at the former compound of U.S. Military Assistance Advisory Group.
He also served as the last Chief of mission (Charge d'affaires) of the U.S. Embassy to the Republic of China (ROC) stationed in Taipei, Taiwan after the departure of Ambassador Leonard S. Unger in 1979. After diplomatic ties between Taipei and Washington severed, he remained on the island to set up the Taipei Main Office of the American Institute in Taiwan (AIT) at the former compound of U.S. Military Assistance Advisory Group (MAAG). 
