Born in New York, New York to Geoffrey and Helen Choate Platt.
Graduates cum laude from Harvard University, receiving a Bachelor of Arts.
Receives a Master of Arts from Johns Hopkins University School of Advanced International Studies.
Commissioned as a Foreign Service officer for the U.S. Department of State.
Becomes a Chinese language trainee at the Foreign Service Institute.
Becomes a political officer and consulate general at the United States Consulate in Hong Kong.
Serves as chief of the Asian Communist Areas Division of the Bureau of Intelligence & Research for the U.S. Department of State.
Becomes deputy director of Executive Secretariat Staff.
Appointed director of staff of Executive Secretariat Staff.
Serves as chief of the Political Section of the United States Liaison Office in Peking, China.
Serves as first secretary of the United States Embassy in Tokyo.
Becomes director of the Office of Japanese Affairs of the U.S. Department of State.
Joins the staff of the National Security Council of the White House.
Becomes deputy assistant and secretary for international security affairs for the U.S. Department of Defense.
Appointed as ambassador to Zambia.
Appointed executive secretary to the Department of State.
Serves as United States ambassador to the Philippines at the U.S. Department of State in Manila.
Serves as United States ambassador to Pakistan at the U.S. Department of State in Islamabad.
Appointed president of the Asia Society in New York City.
Becomes President Emeritus of the Asia Society.