After receiving his B.A. in Government from Dartmouth College and his M.A. in Political Science from Brown University, he joined Thailand's Foreign Service in 1968. Between 1984 and 2000 he was ambassador Extraordinary and Plenipotentiary of Thailand to the United States and then few years later, he became Thailand's Ambassador and Permanent Representative to the United Nation in New York. He served briefly as the Thai Ministry of Foreign Affairs' Permanent Secretary (the most senior civil servant of the Ministry) before retiring from bureaucratic career.
After his retirement, he served as advisor to the foreign minister and as Thailand's chief negotiator for a Thai-US free trade agreement negotiations.
In 2006 he was appointed by the military junta to be Foreign Minister of Thailand, serving in that post until early 2008.
At Dartmouth College, Nitya Pibulsonggram was a member of Kappa Kappa Kappa society class of 1962.
He was the sixth child of Field Marshal Plaek Pibulsonggram and Thanphuying La-iad Bhandhukravi with three sisters and two brothers. One of them, Prasong, was a Vice-Admiral who had served under the Royal Thai Armed Forces.
- The Nation (2014-05-24). "Ex-minister Nitya, 72, passes away". Nationmultimedia.com. Retrieved 2014-05-26.
- Kobkua Suwannathatpian (1995). Thailand's Durable Premier–Phibun Through Three Decades 1932-1957. Oxford University Press. p. 163. ISBN 9676530530.
- Sirin Phathanothai. The Dragon's Pearl. Simon & Schuster. back matter. ISBN 0743217985.
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