During the course of the next thirty-five years, he appeared as an independent freelance chapel organist at the Interfaith Chapel of the Long Island University C W Post Campus in Brookville, New York (1968–2002). In addition to performing liturgical music regularly during interfaith wedding ceremonies, he composed a "Processional for Organ" which was featured during the chapel's dedication ceremony. Working in collaboration with Peg Larson (Assistant Director-Chapel Scheduling), Rabbi Nathaniel Schwartz (Independent Chaplain) and clergymen from the Catholic Church, Serry arranged and performed musical programs for hundreds of wedding parties and their invited guests. His performances featured the Interfaith Chapel's Hammond organ utilizing a Leslie speaker, as well as its baroque Allen organ.