Phi Kappa Tau (ΦKT), commonly known as Phi Tau, is a collegiate fraternity located in the United States. The fraternity was founded in 1906. As of 2013, the fraternity has 146 Chartered Chapters, 81 active chapters, and around 4,000 collegiate members. SeriousFun Children's Network, founded by Beta Chapter alumnus Paul Newman, is Phi Kappa Tau's National Philanthropy. According to its Constitution, Phi Kappa Tau is one of the few social fraternities that can accept graduate students as well as undergraduates.