Delta Sigma Phi (ΔΣΦ, also known as Delta Sig) is a fraternity established at the City College of New York in 1899 and is a charter member of the North-American Interfraternity Conference. The Fraternity is headquartered in the Fairbanks Mansion, the former home of Charles Warren Fairbanks, the U.S. vice president under Theodore Roosevelt. Delta Sigma Phi was one of the first fraternities at C.C.N.Y. (now C.U.N.Y). There are 107 actively operating undergraduate chapters and colonies of the Fraternity in 33 states within the Continental United States and Washington, D.C.