Gina and her roommate were interested in joining a sorority, but the CSU Stanislaus campus did not have a large greek system. There was not a social sorority offered for various ethnicities. So Gina distributed flyers to all the women living in the NEW dorms in 1993, asking if there was interest for a sorority on campus. The response was strong so Gina went about requesting information from Panhellenic sororities that may be interested in coming to CSUS. There were about 10 sororities that replied, but only a few showed deep interest. By this time, a group of women (most from the dorms and their friends) had begun to help Gina with her search.

Installation - December 4, 1994

After reading their literature on what these sororities stood for, Phi Sigma Sigma and Sigma Sigma Sigma were invited to come to campus and present their information to interested women in the South Dining Room. About 60 women attended to hear the information. Both gave excellent presentations and brought pictures, paddles, and sorority info. At the end of the night, a vote was taken on which of the two sororities should be "our" sorority and Phi Sigma Sigma won by a large margin. Women mentioned that they really like the strong emphasis on philanthropy and scholastics that Phi Sig displayed.

This group of women joined together under the leadership of Phi Sigma Sigma and set out to do all the tasks needed as a Colony before becoming a recognized Chapter of PSS. This included holding fundraisers, philanthropies, socials, formal and informal meetings, a successful RUSH, Founder's Day, writing a constitution, and creating items. Each local founder had to learn all the information about the sorority as well has memorize chapter roll. The process took over one year. Founding on the belief of inclusion and that no-one should be discriminated against due to ethnicity or religion, Phi Sigma Sigma has stood through the ages and lives in the hearts of all active sisters and the loving memories of alumnae.

The Central Valley Alumnae Club began in 2001 with alumnae from the Theta Mu chapter. The Phi Sigma Sigma Central Valley Chapter chartered at LTS in Spring 2001 and the Supreme council voted them in, to become a recognized alumnae chapter of Phi Sigma Sigma. They were installed August 2001 and have been going strong ever since.