Po Shun graduated in 1964. Foregoing graduation ceremonies, he traveled with friends to Calabria in Southern Italy to volunteer with Servicio Civile Internationale, a work project to construct an aqueduct in a poor village high up in the remote mountains. He then returned to England to design public housing for Cooperative Planning Ltd and the Brent Housing Authority. He joined the American Friends Service Committee and was sent to a remote part of Mexico, initially to help build a well in a village called Cuauhtenco.