Vintage portrait painting of American statesman and judge John Marshall (1755 - 1835) - the fourth US Chief Justice (1801 - 1835). Marshall, the longest-serving Chief Justice, played a key role in the development of the American legal system and is sometimes referred to as "The Great Chief Justice". Before becoming a lawyer he served in the Continental Army under George Washington during the American Revolutionary War and he represented Virginia in the US House of Representatives from 1799 to 1800. He also served as US Secretary of State from 1800 to 1801 under President John Adams. Painting circa 1832 by Robert Matthew Sully.