Ted Osius is an American diplomat who served as the U.S. Ambassador to Vietnam from 2014 to 2017, where he led a team of 900 and played a pivotal role in deepening economic, security, and cultural ties between the two countries. With a 30-year diplomatic career spanning key postings in Asia and beyond, Osius is recognized for his strategic leadership in transforming U.S.-Vietnam relations from adversaries to comprehensive partners, highlighted by historic meetings and multiple bilateral agreements.