John Marshall was probably the most important figure to serve in all three branches. Although his periods of service in Congress and as Secretary of State were both brief, he was Chief Justice of the United States for nearly 35 years, and had a powerful influence on the development of the Supreme Court.
Following is a list of persons who have served in all three branches of the United States federal government. Membership in this list is limited to persons who have held offices delineated in the Constitution of the United States and laws enacting the relevant constitutional provisions: