Mitsotakis says goodbye to US Ambassador Pyatt and wishes him "the very best for the future"

Greek Prime Minister Kyriakos Mitsotakis and US Ambassador Geoffrey Pyatt

US Ambassador Geoffrey Pyatt received the well wishes of Greek Prime Minister Kyriakos Mitsotakis as he returns to the US to take on a new position as Assistant Secretary of State for Energy Resources

"Saying goodbye (for now) to US Ambassador Geoffrey Pyatt with appreciation for his service and his contribution to developing bilateral relations. Wishing him the very best for the future!" the prime minister wrote in a tweet.

Pyatt was sworn in as the US Ambassador to the Hellenic Republic in September 2016 and had previously served as ambassador to Ukraine from 2013-2016.

He also served at the US Embassy in New Delhi, India as Deputy Chief of Mission and as Political Counselor. Pyatt served as Economic Officer at the U.S. Consulate General in Hong Kong and as Principal Officer at the U.S. Consulate General in Lahore, Pakistan.

Since joining the Foreign Service in 1989, Pyatt has also served as Director for Latin America at the National Security Council; as Special Assistant in the Office of the Deputy Secretary of State; in the Bureau of Inter-American Affairs; and at the U.S. Embassy in New Delhi, India, as well as the U.S. Embassy in Tegucigalpa, Honduras.

He will be replaced by Greek-American George J. Tsunis who was officially confirmed by the United States Senate in March.

READ MORE: Greece stands on the right side of history: US Ambassador Geoffrey Pyatt.