Sigma Pi was founded on February 26,1897, at Vincennes University in Vincennes, Indiana. Sigma Pi became an international fraternity in 1984. Today Sigma Pi boasts over 75,000 members in all walks of life. Sigma Pi Fraternity, International, has over 120 active chapters across North America. Our chapter (Eta-Iota) at California State Univesity, Dominguez Hills was originally chartered on May 13, 1989.