In 1934, James Thompson moves to Ames, IA along with his sons Kenneth and Russell to start a construction firm, aptly named James Thompson & Sons. They acquire their first project that year – the Calmar Creamery in Calmar, IA. The Thompsons build several post offices and their first project at Iowa State: Roberts Hall, which was then a residence hall for female students. In 1938, James Thompson establishes a partnership with his two sons, each serving as equal partners in the firm.