Welcome to the Alpha Xi Chapter of Phi Kappa Sigma at Purdue University. Members of Phi Kappa Sigma focus on a life long membership that few college men enjoy. Brothers work hard to create the lasting friendships that make being a brother a truly rewarding experience both before and after graduation. Over 60,000 men have shared in this brotherhood at more than 70 chapters throughout the United States and Canada. Phi Kappa Sigma currently has numerous alumni active in our community as well as in our Purdue chapter.