Eric Grant John[1] (born 1960)[2] is the current senior advisor for security negotiations and agreements and the former U.S. ambassador to the Kingdom of Thailand, having been appointed October 22, 2007.

He has three tours in Korea, most recently as the minister Counselor for Political Affairs at the U.S. Embassy in Seoul.

He also served as the deputy director of Korean affairs in Washington, D.C. His other tours include deputy principal officer of the U.S. Consulate General in Ho Chi Minh City, Vietnam; the Orderly Departure Program at the U.S. Embassy in Bangkok, Thailand; and the U.S. Embassy in Dar es Salaam, Tanzania.

He currently serves as the foreign policy advisor to the chief of staff of the United States Air Force.

[3][4] Ambassador John learned Portuguese in Brazil as a high school exchange student with AFS Intercultural Programs.