The famous architect known for the design of Monticello was Thomas Jefferson. As the principal author of the Declaration of Independence and the third President of the United States, Jefferson utilized his architectural skills to create his iconic home in Virginia. Monticello reflects Jefferson's neoclassical design principles and love for natural beauty, incorporating extensive gardens and innovative design elements. It served as a personal retreat for Jefferson, as well as a testament to his vision of American ideals and enlightenment principles.