Eric J. Mayer is principal of Westtown Upper School in Westtown Pennsylvania. While teaching high school at Westtown, Mayer created an annotated directory of the Religious Resources of Greater Philadelphia, Religious Resources of Suburban Philadelphia: Organizations, Sites, and Individuals, and distributed it to his colleagues (including teachers, school administrators, weekend planners, department chairs and others) in the Westtown School, located two miles from West Chester Pennsylvania.
This directory was designed to be a resource for teachers in the Philadelphia, Pennsylvania area. It attempted to provide resources that illustrate the religious diversity in the region. As such, it was not exhaustive. Rather it focused on the variety and breadth of religious centers in the area, paying particular attention to individuals and organizations that would welcome interaction with high school students.