| July 10, 1890 26 Stat. 222 |
July 10, 1984 98 Stat. 333 |
December 1, 1990 104 Stat. 5089 |
| Riner, John A. 1890-1921 |
Johnson, Alan B. 1985- |
Downes, William F. 1994-2011 |
| Kennedy, Thomas B. 1921-1955 |
Skavdahl, Scott W. 2011- |
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| Kerr, Ewing T. 1955-1975 |
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| Brimmer, Clarence A., Jr. 1975-2006 |
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| Freudenthal, Nancy D. 2010-2022 |
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| Rankin, Kelly H. 2024- |