In 1973 Campus Crusade for Christ missionary Peter E. Gillquist (1938–2012) of Chicago established a network of house churches throughout the United States, aiming to restore a primitive form of Christianity, which was called the New Covenant Apostolic Order. Researching the historical basis of the Christian faith, Gillquist and his colleagues found sources for this restoration in the writings of the early Church Fathers. This led the group to practice a more liturgical form of worship than in their previous evangelical background.