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 Name: John A. Halderman
State of Residency: Missouri
Title: Minister Resident/Consul General
Appointment: July 13, 1882
Presentation of Credentials: October 23, 1882
Termination of Mission: Left post April 1, 1885
Note: Commissioned to Siam.
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Name: Jacob T. Child
State of Residency: Missouri
Title: Minister Resident/Consul General
Appointment: March 9, 1886
Presentation of Credentials: June 5, 1886
Termination of Mission: Presented recall, January 17, 1891
Note: Commissioned to Siam.
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 Name: Sempronius H. Boyd
State of Residency: Missouri
Title: Minister Resident/Consul General
Appointment: October 1, 1890
Presentation of Credentials: January 17, 1891
Termination of Mission: Relinquished charge, June 13, 1892
Note: Commissioned to Siam.
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 Name: John Barrett
State of Residency: Oregon
Title: Minister Resident/Consul General
Appointment: February 14, 1894
Presentation of Credentials: November 15, 1894
Termination of Mission: Presented recall, April 26, 1898
Note: Commissioned to Siam.
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 Name: Hamilton King
State of Residency: Michigan
Title: Minister Resident/Consul General
Appointment: January 14, 1898
Presentation of Credentials: April 26, 1898
Termination of Mission: Promoted to Envoy Extraordinary and Minister Plenipotentiary
Note: Commissioned to Siam.
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Name: Hamilton King
State of Residency: Michigan
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: April 27, 1903
Presentation of Credentials: July 3, 1903
Termination of Mission: Died at post September 2, 1912
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on November 16, 1903. Commissioned to Siam.
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 Name: Fred W. Carpenter
State of Residency: California
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: September 12, 1912
Presentation of Credentials: January 22, 1913
Termination of Mission: Left post November 16, 1913
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on March 1, 1913. Commissioned to Siam.
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Name: William H. Hornibrook
State of Residency: Oregon
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: February 12, 1915
Presentation of Credentials: May 31, 1915
Termination of Mission: Presented recall, October 24, 1916
Note: Commissioned to Siam.
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Name: George Pratt Ingersoll
State of Residency: Connecticut
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: August 8, 1917
Presentation of Credentials: November 24, 1917
Termination of Mission: Left post June 23, 1918
Note: Commissioned to Siam.
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 Name: George W. P. Hunt
State of Residency: Arizona
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: May 18, 1920
Presentation of Credentials: September 6, 1920
Termination of Mission: Left post October 1, 1921
Note: Commissioned to Siam.
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 Name: Edward E. Brodie
State of Residency: Oregon
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: October 8, 1921
Presentation of Credentials: January 31, 1922
Termination of Mission: Left post May 2, 1925
Note: Commissioned to Siam.
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 Name: William E. Russell
State of Residency: District of Columbia
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: September 28, 1925
Presentation of Credentials: [January 9, 1926]
Termination of Mission: Left post January 7, 1927
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on December 17, 1925. Commissioned to Siam. Officially received on January 9, 1926.
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Name: Harold Orville MacKenzie
State of Residency: New Jersey
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: March 3, 1927
Presentation of Credentials: June 28, 1927
Termination of Mission: Left post March 29, 1930
Note: Commissioned to Siam.
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 Name: David E. Kaufman
State of Residency: Pennsylvania
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: June 12, 1930
Presentation of Credentials: December 9, 1930
Termination of Mission: Left post June 15, 1933
Note: Commissioned to Siam.
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 Name: James Marion Baker
State of Residency: South Carolina
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: August 30, 1933
Presentation of Credentials: December 9, 1933
Termination of Mission: Left post May 2, 1936
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on January 15, 1934. Commissioned to Siam.
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 Name: Edwin L. Neville
State of Residency: Ohio
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: May 28, 1937
Presentation of Credentials: October 2, 1937
Termination of Mission: Left post May 1, 1940
Note: Commissioned to Siam.
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Name: Hugh Gladney Grant
State of Residency: Alabama
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: April 3, 1940
Presentation of Credentials: August 20, 1940
Termination of Mission: Left post August 30, 1941
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 Name: Willys R. Peck
State of Residency: California
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: August 19, 1941
Presentation of Credentials: September 16, 1941
Termination of Mission: Japanese forces occupied Bangkok, December 8, 1941
Note: Thailand declared war on the United States January 25, 1942. Peck, having been interned, left post June 29, 1942.
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 Name: Charles W. Yost
State of Residency: New York
Title: Charg้ d'Affaires
Appointment: [see note below]
Presentation of Credentials: January 5, 1946
Termination of Mission: Superseded, July 4, 1946
Note: Not commissioned; letter of credence sent to Yost by telegram, October 16, 1945.
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 Name: Edwin F. Stanton
State of Residency: California
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: April 27, 1946
Presentation of Credentials: July 4, 1946
Termination of Mission: Promoted to Ambassador Extraordinary and Plenipotentiary
Note: Commissioned to Siam.
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Name: Edwin F. Stanton
State of Residency: California
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: April 10, 1947
Presentation of Credentials: May 9, 1947
Termination of Mission: Left post June 30, 1953
Note: Commissioned to Siam. The Legation in Bangkok had been raised to Embassy status March 18, 1947.
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 Name: William J. Donovan
State of Residency: New York
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: August 3, 1953
Presentation of Credentials: September 4, 1953
Termination of Mission: Left post August 21, 1954
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 Name: John E. Peurifoy
State of Residency: South Carolina
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: September 15, 1954
Presentation of Credentials: December 3, 1954
Termination of Mission: Died near Hua Hin, August 12, 1955
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on December 3, 1954.
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 Name: Max Waldo Bishop
State of Residency: Arkansas
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: December 3, 1955
Presentation of Credentials: January 9, 1956
Termination of Mission: Left post January 6, 1958
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on January 18, 1956.
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 Name: U. Alexis Johnson
State of Residency: California
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: January 30, 1958
Presentation of Credentials: February 14, 1958
Termination of Mission: Left post April 10, 1961
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 Name: Kenneth Todd Young
State of Residency: New York
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: March 29, 1961
Presentation of Credentials: June 22, 1961
Termination of Mission: Left post August 19, 1963
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 Name: Graham A. Martin
State of Residency: Florida
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: September 10, 1963
Presentation of Credentials: November 7, 1963
Termination of Mission: Left post September 9, 1967
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 Name: Leonard Unger
State of Residency: Maryland
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: August 11, 1967
Presentation of Credentials: October 4, 1967
Termination of Mission: Left post November 19, 1973
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 Name: William R. Kintner
State of Residency: Pennsylvania
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: September 28, 1973
Presentation of Credentials: November 29, 1973
Termination of Mission: Left post March 15, 1975
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 Name: Charles S. Whitehouse
State of Residency: Virginia
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: May 8, 1975
Presentation of Credentials: May 30, 1975
Termination of Mission: Left post June 19, 1978
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 Name: Morton I. Abramowitz
State of Residency: Massachusetts
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: June 27, 1978
Presentation of Credentials: August 9, 1978
Termination of Mission: Left post July 31, 1981
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 Name: John Gunther Dean
State of Residency: New York
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: October 1, 1981
Presentation of Credentials: October 26, 1981
Termination of Mission: Left post June 6, 1985
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 Name: William Andreas Brown
State of Residency: New Hampshire
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: June 6, 1985
Presentation of Credentials: July 5, 1985
Termination of Mission: Left post August 5, 1988
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 Name: Daniel Anthony O'Donohue
State of Residency: Virginia
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Jul 11, 1988
Presentation of Credentials: August 13, 1988
Termination of Mission: Left post August 10, 1991
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 Name: David Floyd Lambertson
State of Residency: Kansas
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: July 22, 1991
Presentation of Credentials: September 24, 1991
Termination of Mission: Left post August 25, 1995
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 Name: William H. Itoh
State of Residency: New Mexico
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Dec 19, 1995
Presentation of Credentials: February 20, 1996
Termination of Mission: Left post February 1, 1999
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 Name: Richard E. Hecklinger
State of Residency: Virginia
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: December 1, 1998
Presentation of Credentials: March 9, 1999
Termination of Mission: Left post December 21, 2001
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 Name: Darryl N. Johnson
State of Residency: Washington
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: November 26, 2001
Presentation of Credentials: March 29, 2002
Termination of Mission: Left post December 28, 2004
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 Name: Ralph L. Boyce
State of Residency: Virginia
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: July 2, 2004
Presentation of Credentials: March 9, 2005
Termination of Mission: Left post December 28, 2007
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 Name: Eric G. John
State of Residency: Indiana
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: May 21, 2007
Presentation of Credentials: January 8, 2008
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