Thomas Ustick Walter

Thomas Ustick Walter (September 4, 1804 – October 30, 1887) of Philadelphia, Pennsylvania was the fourth Architect of the United States Capitol building, responsible for adding the north (Senate) and south (House) wings and the central dome that brought the building to essentially its current appearance.

Walter received early training in a variety of fields including masonry, mathematics, physical science, and the fine arts before studying architecture in the office of William Strickland. He began practicing architecture in 1830 and was one of the founders and second president of the American Institute of Architects.