The chapter here began as a local, secret organization known as the Polytechnic Institute Experimental Science Fraternity, or the P.I.E.S. In 1925 this group affiliated on a national basis when it joined Theta Kappa Nu, which eventually became the present day Theta Kappa Zeta of Lambda Chi Alpha when Lambda Chi Alpha and Theta Kappa Nu merged in 1939. The brothers of Theta Kappa Zeta feel that fraternal life has much to offer Rose-Hulman students and are incredibly proud to be a part of Rose-Hulman's Greek system.