US Department of State
U.s. Department of State: Thomas Jefferson: First Secretary of State, 1790 1793
This site by the Bureau of Public Affairs, U.S. Department of State offers information about Thomas Jefferson's role as the first Secretary of State to George Washington.
Other
Hall of the Secretaries of State: Thomas Jefferson
This resource provides a brief profile account of Jefferson's career as a Secretary of State. It includes a list of notable events during his office.