| Time Served | Nominated by | Librarian | % Correct |
|---|---|---|---|
| December 31, 1864 - June 30, 1897 | Abraham Lincoln | Ainsworth Spofford | 100%
|
| (Acting) January 18, 1899 - December 11, 1899 | Ainsworth Spofford | 100%
| |
| October 2, 1939 - December 19, 1944 | Franklin D. Roosevelt | Archibald MacLeish | 100%
|
| September 14, 2016 - May 8, 2025 | Barack Obama | Carla Hayden | 100%
|
| November 12, 1975 -June 15, 1987 | Gerald Ford | Daniel Boorstin | 100%
|
| (Acting) October 1, 2015 - September 13, 2016 | David Mao | 100%
| |
| March 21, 1815 - May 28, 1829 | James Madison | George Watterston | 100%
|
| December 12, 1899 - October 1, 1939 | William McKinley | Herbert Putnam | 100%
|
| September 14, 1987 - September 30, 2015 | Ronald Reagan | James Billington | 100%
|
| January 26, 1802 - April 8, 1807 | Thomas Jefferson | John Beckley | 100%
|
| (Acting) January 1, 1975 -November 11, 1975 | John Lorenz | 100%
| |
| May 28, 1829 - May 23, 1861 | Andrew Jackson | John Meehan | 100%
|
| May 24, 1861 - December 31, 1864 | Abraham Lincoln | John Stephenson | 100%
|
| July 1, 1897 - January 17, 1899 | William McKinley | John Young | 100%
|
| (Acting) December 19, 1944 - June 29, 1945 | Luther Evans | 100%
| |
| June 30, 1945 - July 5, 1953 | Harry Truman | Luther Evans | 100%
|
| November 6, 1807 - January 28, 1815 | Thomas Jefferson | Patrick Magruder | 100%
|
| September 1, 1954 - December 31, 1974 | Dwight D. Eisenhower | Quincy Mumford | 100%
|
| (Acting disputed) May 8, 2025 - Present | Robert Newlen | 100%
| |
| (Acting Disputed) May 12, 2025 - Present | Todd Blanche | 100%
| |
| (Acting) July 6, 1953 - August 30, 1954 | Verner Clapp | 100%
|