"Thomas Jefferson (1743/04/13-1826/07/04), United States President from March 4, 1801 to March 4, 1809, was not a freemason. Although he participated in the masonic cornerstone laying of his University at Charlottesville and, on the occasion, praised Freemasonry, his own words demonstrated that he had never been a member of the Craft."

http://freemasonry.bcy.ca/anti-masonry/jefferson.html