John Marshall (1755-1835) was an American politician and lawyer who served as the fourth Chief Justice of the United States from 1801 to 1835. Marshall remains the longest-serving chief justice and fourth-longest serving justice in Supreme Court history, and he is widely regarded as one of the most influential justices to ever sit on the Supreme Court. Prior to joining the Supreme Court (and for one month simultaneous to his tenure as Chief Justice), Marshall served as the United States Secretary of State under President John Adams.