John Marshall (September 24, 1755 - July 6, 1835) was the longest-serving Chief Justice of the United States (1801-35). Marshall's court opinions helped establish the basis for American constitutional law and made the Supreme Court of the United States a coequal branch of government along with the legislative and executive branches. Previously, Marshall had been a leader of the Federalist Party in Virginia and served in the United States House of Representatives from 1799 to 1800. He was Secretary of State under President John Adams from 1800 to 1801. Between 1805 and 1807 Marshall published an influential five-volume biography of George Washington. Marshall's Life of Washington was based on records and papers provided to him by the late president's family. The work reflected Marshall's Federalist principles, and is frequently praised by historians for its accuracy and well-reasoned judgments.