Canada

Name: William Phillips
State of Residency: Massachusetts
Foreign Service officer
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: Feb 17, 1927
Presentation of Credentials: Jun 1, 1927
Termination of Mission: Left post, Dec 14, 1929

Name: Hanford MacNider
State of Residency: Iowa
Non-career appointee
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: Jun 20, 1930
Presentation of Credentials: Aug 29, 1930
Termination of Mission: Relinquished charge, Aug 15, 1932

Name: Nathan William MacChesney
State of Residency: Illinois
Non-career appointee
Title: Envoy Extraordinary and Minister Plenipotentiary
Note: Not commissioned; nomination not confirmed by the Senate.

Name: Warren Delano Robbins
State of Residency: New York
Foreign Service officer
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: May 11, 1933
Presentation of Credentials: May 16, 1933
Termination of Mission: Left post, Mar 28, 1935

Name: Norman Armour
State of Residency: New Jersey
Foreign Service officer
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: May 29, 1935
Presentation of Credentials: Aug 7, 1935
Termination of Mission: Left post, Jan 15, 1938

Name: Daniel C. Roper
State of Residency: District of Columbia
Non-career appointee
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: May 9, 1939
Presentation of Credentials: May 19, 1939
Termination of Mission: Appointed terminated, Aug 20, 1939

Name: James H. R. Cromwell
State of Residency: New Jersey
Non-career appointee
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: Jan 12, 1940
Presentation of Credentials: Jan 24, 1940
Termination of Mission: Left post, May 16, 1940

Name: Jay Pierrepont Moffat
State of Residency: New Hampshire
Foreign Service officer
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: Jun 4, 1940
Presentation of Credentials: Jun 13, 1940
Termination of Mission: Died at post, Jan 24, 1943
Note: Accredited also to Luxembourg; resident at Ottawa.

Name: Ray Atherton
State of Residency: Illinois
Foreign Service officer
Title: Envoy Extraordinary and Minister Plenipotentiary
Appointment: Jul 8, 1943
Presentation of Credentials: Aug 3, 1943
Termination of Mission: Promoted to Ambassador Extraordinary and Plenipotentiary
Note: Accredited also to Denmark and Luxembourg; resident at Ottawa.

Name: Ray Atherton
State of Residency: Illinois
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Nov 18, 1943
Presentation of Credentials: Nov 19, 1943
Termination of Mission: Left post, Aug 30, 1948

Name: Laurence A. Steinhardt
State of Residency: New York
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Aug 12, 1948
Presentation of Credentials: Nov 1, 1948
Termination of Mission: Died near Ramsayville, Mar 28, 1950
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on Mar 2, 1949.

Name: Stanley Woodward
State of Residency: Pennsylvania
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: May 23, 1950
Presentation of Credentials: Jun 22, 1950
Termination of Mission: Left post, Jan 14, 1953

Name: R. Douglas Stuart
State of Residency: Illinois
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: May 28, 1953
Presentation of Credentials: Jul 15, 1953
Termination of Mission: Left post, May 4, 1956

Name: Livingston T. Merchant
State of Residency: District of Columbia
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: May 7, 1956
Presentation of Credentials: May 23, 1956
Termination of Mission: Left post, Nov 6, 1958

Name: Richard B. Wigglesworth
State of Residency: Massachusetts
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Oct 29, 1958
Presentation of Credentials: Dec 15, 1958
Termination of Mission: Left post, Oct 19, 1960
Note: Commissioned during a recess of the Senate; recommissioned after confirmation on Jan 29, 1959.

Name: Livingston T. Merchant
State of Residency: District of Columbia
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Feb 20, 1961
Presentation of Credentials: Mar 15, 1961
Termination of Mission: Left Canada, May 26, 1962

Name: W. Walton Butterworth
State of Residency: Louisiana
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Oct 4, 1962
Presentation of Credentials: Dec 11, 1962
Termination of Mission: Left post, Sep 10, 1968

Name: Harold Francis Linder
State of Residency: New York
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Jul 24, 1968
Presentation of Credentials: Sep 10, 1968
Termination of Mission: Left post, Jul 9, 1969

Name: Adolph W. Schmidt
State of Residency: Pennsylvania
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Jul 8, 1969
Presentation of Credentials: Sep 11, 1969
Termination of Mission: Left post, Jan 29, 1974

Name: William J. Porter
State of Residency: Massachusetts
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Feb 11, 1974
Presentation of Credentials: Mar 13, 1974
Termination of Mission: Left post, Dec 16, 1975

Name: Thomas O. Enders
State of Residency: Connecticut
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Dec 22, 1975
Presentation of Credentials: Feb 17, 1976
Termination of Mission: Left post, Sep 14, 1979

Name: Kenneth M. Curtis
State of Residency: Maine
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Sep 28, 1979
Presentation of Credentials: Oct 5, 1979
Termination of Mission: Left post, Jan 20, 1981

Name: Paul Heron Robinson, Jr.
State of Residency: Illinois
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Jul 10, 1981
Presentation of Credentials: Jul 15, 1981
Termination of Mission: Left post, Sep 9, 1985

Name: Thomas Michael Tolliver Niles
State of Residency: District of Columbia
Foreign Service officer
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Aug 1, 1985
Presentation of Credentials: Sep 10, 1985
Termination of Mission: Left post, Jun 28, 1989

Name: Edward N. Ney
State of Residency: New York
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: May 12, 1989
Presentation of Credentials: Jun 30, 1989
Termination of Mission: Left post, Jun 29, 1992

Name: Peter Barry Teeley
State of Residency: Virginia
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Jun 15, 1992
Presentation of Credentials: Jul 3, 1992
Termination of Mission: Left post, Feb 19, 1993

Name: James J. Blanchard
State of Residency: Michigan
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Aug 2, 1993
Presentation of Credentials: Aug 19, 1993
Termination of Mission: Left post, Mar 29, 1996

Note:  The following officers served as Charges d'Affaires ad interim:  James Donald Walsh (Mar 1996-May 1997) and James G. Weston (Jun 1997-Sep 1997).

Name: Gordon G. Giffin
State of Residency: Georgia
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Aug 13, 1997
Presentation of Credentials: Sep 17, 1997
Termination of Mission: Left post Mar 1, 2001

Name: Argeo Paul Cellucci
State of Residency: Massachusetts
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: April 9, 2001
Presentation of Credentials: April 17, 2001
Termination of Mission: Left post, Mar 18, 2005

Name: David Horton Wilkins
State of Residency: South Carolina
Non-career appointee
Title: Ambassador Extraordinary and Plenipotentiary
Appointment: Jun 1, 2005
Presentation of Credentials: Jun 24, 2004
Termination of Mission: