Who is the longest-serving Chief Justice of the United States?

Who is the longest-serving Chief Justice of the United States? The answer is John Marshall.

Marshall served as the fourth Chief Justice from 1801 until his death in 1835, a tenure of more than 34 years. President John Adams appointed him after Marshall had served as secretary of state, and the Senate confirmed him in early 1801.

His long tenure helped shape the Supreme Court into a powerful and independent branch of government. In Marbury v. Madison, the Court asserted judicial review, while decisions such as McCulloch v. Maryland and Gibbons v. Ogden strengthened federal authority and developed constitutional principles that remain influential.

The common confusion is between longest-serving Chief Justice and longest-serving Supreme Court justice overall. Those are different records. Marshall holds the chief-justice record, while other justices have accumulated longer or comparable service as associate justices. He also served during the Court’s early years, when justices traveled on circuit and the modern Supreme Court building did not yet exist.