Jacob Shallus (or Shalus; 1750–April 18, 1796) was the engrosser or penman of the original copy of the United States Constitution. The handwritten document that Shallus engrossed is on display at the National Archives Building in Washington.Shallus was the son of German immigrants, Valentine Schallus and Frederica Catherina. His brother Thomas Shallus was a mapmaker. He was born a year after his father Valentine immigrated to Pennsylvania and was a volunteer in the Revolutionary War.