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Phi Kappa Sigma (ΦΚΣ) is an international all-male college secret and social fraternity. While nicknames differ from institution to institution, the most common nicknames for the fraternity are Skulls, Skullhouse, Phi Kap, and PKS (the first two because of the skull and crossbones on the fraternity's badge and coat of arms). Phi Kappa Sigma was founded by Dr. Samuel Brown Wylie Mitchell at the University of Pennsylvania. Mitchell recorded the initial ideas and concepts of Phi Kappa Sigma on August 16, 1850. He then began to discuss the idea with other students, first Charles Hare Hutchinson, and then Alfred Victor du Pont (son of Alfred V. du Pont), John Thorne Stone, Andrew Adams Ripka, James Bayard Hodge, and Duane Williams. The seven men formally founded the fraternity on October 19, 1850 becoming the founding fathers of Phi Kappa Sigma Phi Kappa Sigma is a charter member of the North-American Interfraternity Conference, and since 2017, is headquartered in Carmel, Indiana. Prior to that, starting with its founding in 1850, the fraternity was based out of Philadelphia, Valley Forge and Chester Springs, Pennsylvania.