Theta Chi Fraternity | 16,610 followers on LinkedIn. Founded in 1856, Theta Chi Fraternity is a men's collegiate fraternity with more than 215,000 members and 245 chapters. | Theta Chi is one of the oldest men’s college fraternities in North America. Founded in 1856, more than 215,000 members have enjoyed the Fraternity’s traditions, ideals and fellowship. Founded on the principle of friendship through the mutual assistance of every member, Theta Chi aims to provide its members with an enjoyable and fulfilling collegiate experience that also prepares them for rewarding, successful lives after graduation.