Frank Heyling Furness was an American architect of the Victorian era. He designed more than 600 buildings, most in the Philadelphia area, and is remembered for his diverse, muscular, often inordinately scaled buildings, and for his influence on the Chicago-based architect Louis Sullivan. Furness also received a Medal of Honor for bravery during the Civil War.

Louis Henry Sullivan was an American architect, and has been called a "father of skyscrapers" and "father of modernism." He was an influential architect of the Chicago School, a mentor to Frank Lloyd Wright, and an inspiration to the Chicago group of architects who have come to be known as the Prairie School. Along with Wright and Henry Hobson Richardson, Sullivan is one of "the recognized trinity of American architecture." The phrase "form follows function" is attributed to him, although the idea was theorised by Viollet le Duc who considered that structure and function in architecture should be the sole determinants of form. In 1944, Sullivan was the second architect to posthumously receive the AIA Gold Medal.