Thomas Jefferson
(1743-1826) was  an 
American statesman,
lawyer, diplomat,
and Founding Father  who served as the third President of the United States from 1801-1809.  He was the principal author of the Declaration of Independence.  He was a driving force behind the ideas of republicanism, democracy and individual rights in the Continental Congress and afterwards as President.  Along with James Madison he was the founder of the Democratic-Republican Party.  As President he is noted for the Louisiana Purchase and challenging the Barbary Pirates, plus imposing a trade emargo on Britain that gave rise to the War of 1812 after he left office. 
                   The colonial period                     influence on the                         design and                                     construction of Monticello is quite limited.  The "first Monticello" as historians call it was little more than the beginning of the design of the house in 1768 plus the construction of the South Pavillion into which Jefferson and his newlywed wife, Martha Wayles Skelton, moved in 1770.  In 1794 after spending years as a minister in France and as Secretary of State, Jefferson began remodeling his house based on ideas he had acquired while in France.  The house we see today was basically completed by 1809, making it mostly a classical building from the federal period rather than the Georgian designs normally seen in colonial Virginia.  
Photo by Jack Looney for the Philadelphia Enquirer