Phi Kappa Sigma International Fraternity was founded by Samuel Brown Wylie Mitchell at the University of Pennsylvania on August 16, 1850. Phi Kappa Sigma International Fraternity has Chapters in both the United States and Canada and currently has over 60 active Chapters, Colonies, and interest groups with over 2,000 active members and 40,000 living alumni.

Phi Kappa Sigma is more than an organization to be a part of during college; it is a valuable learning experience, a life-ling commitment, and philosophy of life. Along with the Phi Kappa Sigma Ritual, our Purpose and Principles state who and what we are as a Fraternity and as members of that Fraternity. All members take an oath to uphold these ideals and it is up to all of us to make sure that we, and those who come after us, learn and understand what it is to be a true "Phi Kap" and "Man of Honor" and incorporate that into our Chapters and into our lives.

The theme of our 89th Grand Chapter was "A Return to Our Founding Principles" and since then Phi Kappa Sigma has been working with our Chapters to help them re-focus on the Purpose and Principles that Phi Kappa Sigma was founded on over 153 years ago. We drafted a Statement of Core Values at our 90th Grand Chapter in Philadelphia in the summer of 2000, and have started an annual leadership development program called "Men of Honor." In 2004 at our 92nd Grand Chapter in Chicago, our members created the Doctrine of Excellence.  The Doctrine of Excellence will serve as a road map for our Fraternity to apply our Statement of Core Values.

In the summer of 2000, Phi Kappa Sigma also completed the last phase of our substance-free housing initiative joining several other fraternities committed to providing safe and healthy living environments for our undergraduate members. We have been working hard to make sure our members have an excellent undergraduate experience and graduate to become more than just productive members of society, but leaders that possess a foundation built on steadfast values and a duty to help their fellow man.