Like the country itself, mathematics in the United States was in its infancy in the early nineteenth century. Theodore Strong was one of America’s first major mathematicians, making contributions to the proof of Stewart’s conjectures on the geometry of the circle and introducing then-recent elements from the European continent to the study of calculus in the U.S. After studying at Yale, Strong taught at Hamilton College in New York and Rutgers University in New Jersey. He was a charter member of the National Academy of Sciences.