Alpha Sigma Phi is a social fraternity, founded at Yale University in 1845, whose vision is to Better the World through Better Men.​

Our fraternity is founded upon five values of character: Silence, Charity, Purity, Honor, and Patriotism. Alpha Sig's mission is to provide values-driven brotherhood experiences through life.​

Alpha Sig's motto is "to Better the Man", which is further extended in our purpose through the creation and perpetuation of brotherhood founded upon our five values of character.​The

The Northern Arizona University Chapter, established in 2017, was named the Theta Chi chapter. Theta Chi has come a long way in just a few years and has won many awards along the way, showcasing our unwavering growth.