The Eastern Orthodox Church, officially called the Orthodox Catholic Church and commonly referred to as the Orthodox Church, is the second largest Christian church in the world, with an estimated 300 million adherents mainly in the countries of Belarus, Bulgaria, Cyprus, Georgia, Greece, Macedonia, Moldova, Montenegro, Romania, Russia, Serbia, and Ukraine, all of which are majority Eastern Orthodox. It teaches that it is the One, Holy, Catholic and Apostolic Church established by Jesus Christ and his Apostles almost 2,000 years ago.

The Orthodox Church is composed of several self-governing ecclesial bodies, each geographically and nationally distinct but theologically unified. Each self-governing (or autocephalous) body, often but not always encompassing a nation, is shepherded by a Holy Synod whose duty, among other things, is to preserve and teach the apostolic and patristic traditions and related church practices. Like the Roman Catholic Church, Anglican Communion, Assyrian Church of the East, Oriental Orthodoxy and some other churches, Orthodox bishops trace their lineage back to the apostles through the process of apostolic succession.

Frank Schaeffer (born August 3, 1952) is an American author, film director, screenwriter and public speaker. He is the son of the late theologian and author Francis Schaeffer. He became a Hollywood film director and author, writing several internationally acclaimed novels depicting life in a strict fundamentalist household including Portofino, Zermatt, and Saving Grandma.

In 1990 Schaeffer became an Orthodox Christian as a member of the Orthodox Church, which he says "embraces paradox and mystery".^{[citation needed]} He converted in 1992 at a Greek Orthodox Church in Newburyport, MA.

In 2006 he published Baby Jack, a novel about a marine killed in Iraq. He is also known for his best-selling non-fiction books related to the United States Marine Corps, including Keeping Faith—A Father-Son Story About Love and the United States Marine Corps, co-written with his son John Schaeffer, and AWOL—The Unexcused Absence Of America's Upper Classes From Military Service and How It Hurts Our Country, co-authored with former Clinton presidential aide Kathy Roth-Douquet.