The Internet School of Orthodox Studies Fall 1999 series of 90 minute educational classes are intended to assist Orthodox Christians to more fully prepare themselves for each week’s respective Sunday Orthros and Liturgy. This series is presented by Rev. Fr. Frank Marangos, Rev. Fr. Michael Bird, Rev. Fr. Christopher Makiej, Rev. Dr. Constantine Newman, Rev. Fr. Andrew George, Rev. Fr. Nicholas Kastanas, Rev. Dr. Nick Krommydas, and Rev. Fr. Theodore Barbas.

Established by the Department of Religious Education in 1998, ISOS ran through the Fall of 2005 as a means to assist Orthodox Christians to better understand the teachings of the Orthodox Church. These classes have all been archived on the website with the assistance of the Archdiocese Department of Internet Ministries.