[1] [2] He was chairman of Conciliar Press (Ben Lomond, California) and the author of numerous books, including Love Is Now, The Physical Side of Being Spiritual and Becoming Orthodox.

[4] After graduating, he became a full-time staff member of Campus Crusade for Christ in the 1960s, starting a ministry at the University of Notre Dame and ultimately becoming a regional director with the organization.

Robert Hedges, Gillquist served as the official co-chaplain of the Sigma Alpha Epsilon fraternity, providing spiritual guidance and pastoral care to its membership.

[3] In 1973, Gillquist and his colleagues in 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.

Gillquist and other EOC leaders traveled to Istanbul to meet with Patriarch Demetrios I of Constantinople but were unable to complete any substantial progress toward their goal.