Driven by the need to support STEM education in the Philippines and to foster fellowship among alumni across the world, a group of alumni of the Philippine Science High School (PSHS) based in North America who came from different  graduating classes,  established a nonprofit organization called the Philippine Science High School (PSHS) International Alumni Foundation, Inc., also known as "Pisayian". Pisayian is a nonprofit organization recognized by the IRS under section 501(c)(3). Membership is open to alumni from any campus of the PSHS system who are either currently or formerly based in North America.