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THETA CHI FRATERNITY WelCome THETA CHI FRATERNITY While being a part of Greek life at Oregon State University is a great way to make new friends and start networking being a part of Theta Chi is all about brotherhood making life long friendships and service to others. During the pledging process the brothers of Theta Chi Sigma Chapter led by the Marshal teach you etiquette professionalism academic success different ways to help others at all times and of course the becoming of a Resolute Man. When you join Theta Chi you arent just joining Greek Life youre joining the strongest brotherhood on campus. QUICK FACTS Contact Us Email thetachi.