Table:
0
A
B
C
D
E
1
Name
Background
Title
Appointment
Presentation of Credentials
2
William H. Christensen
Non-career appointee
Chargé d'Affaires ad interim
August 31, 1962
August 31, 1962
3
Robert G. Miner
Foreign Service officer
Ambassador Extraordinary and Plenipotentiary
October 23, 1962
December 1, 1962
4
William A. Costello
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
September 13, 1967
October 26, 1967
5
J. Fife Symington, Jr.
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
July 8, 1969
September 11, 1969
6
Anthony D. Marshall
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
February 15, 1972
February 22, 1972
7
Lloyd I. Miller
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
December 19, 1973
February 8, 1974
8
Albert B. Fay
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
February 4, 1976
February 17, 1976
9
Richard K. Fox, Jr.
Foreign Service officer
Ambassador Extraordinary and Plenipotentiary
July 8, 1977
July 21, 1977
10
Irving G. Cheslaw
Foreign Service officer
Ambassador Extraordinary and Plenipotentiary
September 28, 1979
October 18, 1979
11
Melvin Herbert Evans
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
December 1, 1981
January 1, 1982
12
Sheldon J. Krys
Foreign Service officer
Ambassador Extraordinary and Plenipotentiary
July 12, 1985
August 19, 1985
13
Charles A. Gargano
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
July 15, 1988
August 9, 1988
14
Sally G. Cowal
Foreign Service officer
Ambassador Extraordinary and Plenipotentiary
August 2, 1991
August 27, 1991
15
Brian J. Donnelly
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
July 5, 1994
September 5, 1994
16
Edward E. Shumaker III
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
October 24, 1997
January 13, 1998
17
Roy L. Austin
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
October 1, 2001
December 6, 2001
18
Beatrice Wilkinson Welters
Non-career appointee
Ambassador Extraordinary and Plenipotentiary
April 27, 2010
2010
19
Margaret B. Diop
Foreign Service officer
Chargé d'Affaires ad interim
October 2012
Unknown

Questions and formulas:
Question: Who presented their credentials at an unknown date?
Formula: FILTER(A1,E1="unknown")
Formula2: FILTER(A2:A19,E2:E19="unknown")
Level: easy
Question: When did Robert G. Miner present his credentials?
Formula: FILTER(E1,A1="robert g. miner")
Formula2: FILTER(E2:E19,A2:A19="robert g. miner")
Level: easy
Question: When was William A. Costello appointed?
Formula: FILTER(D1,A1="william a. costello")
Formula2: FILTER(D2:D19,A2:A19="william a. costello")
Level: easy
Question: Who was appointed on October 24, 1997?
Formula: FILTER(A1,D1="october 24, 1997")
Formula2: FILTER(A2:A19,D2:D19="october 24, 1997")
Level: easy
Question: What was Anthony D. Marshall's title?
Formula: FILTER(C1,A1="anthony d. marshall")
Formula2: FILTER(C2:C19,A2:A19="anthony d. marshall")
Level: easy