What was the significance of John Marshall?

John Marshall was the Chief Justice of the United States from February 4, 1801 to July 6, 1835, a tenure of 34 years that established the modern role of the Supreme Court and decided a series of cases that strengthened federal power, established judicial review, and shaped American constitutional law for the next two centuries. He was born on September 24, 1755 in a log cabin in Germantown (now Midland), Virginia, the eldest of fifteen children of Thomas Marshall and Mary Keith. He served as a Continental Army officer during the Revolutionary War, including the winter at Valley Forge from 1777 to 1778.

After the war he studied law briefly under George Wythe at the College of William and Mary in 1780, joined the Virginia bar, served in the Virginia House of Delegates, and helped lead Federalist forces in Virginia's ratification of the Constitution in 1788. He served as a member of the U.S. delegation to France in the XYZ Affair of 1797 to 1798, in the U.S. House from 1799 to 1800, and as Secretary of State under President John Adams from May 1800 to March 4, 1801. President Adams nominated Marshall as Chief Justice on January 20, 1801 and the Senate confirmed him on January 27, 1801. Marshall took office at age 45.

As Chief Justice he transformed the Supreme Court. Before Marshall, the Court was a weak institution that often issued seriatim opinions (each justice writing separately) and that had decided few major cases. Marshall introduced the practice of writing single majority opinions for the Court, often delivered by him personally, that spoke with institutional authority.

Marshall's most influential decisions included Marbury v. Madison (1803) establishing judicial review of federal laws, Fletcher v. Peck (1810) striking down a state law for violating the contracts clause, McCulloch v. Maryland (1819) upholding the Bank of the United States and articulating the doctrine of implied powers, Cohens v. Virginia (1821) establishing federal court jurisdiction over state criminal cases involving federal questions, Gibbons v. Ogden (1824) interpreting the commerce clause broadly, and Worcester v. Georgia (1832) ruling that Georgia's laws had no authority within Cherokee territory. Marshall also presided over the treason trial of Aaron Burr in 1807, ruling that treason required overt acts of war.

He served alongside seven Presidents (Adams, Jefferson, Madison, Monroe, J.Q. Adams, Jackson, and most of Andrew Jackson's term). His broad nationalist constitutional vision often conflicted with Jeffersonian and Jacksonian preferences for limited federal power. He died on July 6, 1835 in Philadelphia at age 79, leaving the Court and the Constitution profoundly transformed.