John Burgess is a professor at Pittsburgh Theological Seminary who has spent years covering the revival of Orthodoxy in Russia.

Malkhaz Songulashvili is the metropolitan bishop of Tbilisi, Georgia. Songulashvili is the leader of the Evangelical Baptist Church of Georgia and a professor of comparative theology and religious ethics. As leader of the Peace Cathedral in Tbilisi, he has been outspoken on Russian aggression in post-Communist states.

Caroline Dunbar of the Yale MacMillan Center’s European Studies Council researches church-and-state relations in 20th-century and post-Soviet Ukraine and Russia; Soviet anti-religious policy; and the historical role of Eastern Orthodoxy in the development of Ukrainian cultural identities.

Wasyl Hrynkiw is pastor at St. Vladimir Ukrainian Catholic Church in Hempstead, New York.

Katherine Kelaidis is an independent scholar who writes about religion and politics for Religion Dispatches and about Orthodoxy for Public Orthodoxy. She has written about the connection between U.S. white supremacists and Orthodox Christianity.

AIDRom is a project of the Ecumenical Association of the Churches of Romania that encourages member churches to promote environmental protection, ecological education and sustainable development. Members include the Orthodox Church, the Reformed Church, the German Lutheran Church, the Synodo-Presbyterial Church of AC and the Armenian Orthodox Church. It is based in Bucharest, Romania.

Paul McPartlan is Carl J. Peter Professor of Systematic Theology and Ecumenism at The Catholic University of America in Washington, D.C. McPartlan’s areas of expertise include ecumenism, especially Catholic-Orthodox relations; and Vatican II. He is a member of the International Theological Commission, a group of 30 theologians who advise the Vatican on theological issues.

Fotios K. Litsas of the University of Illinois at Chicago maintains an online dictionary of terms associated with Orthodox Christianity.

Antiochian Catholic Church in America is an online resource for Orthodox Christians. The website provides the history and beliefs of the Church and multiple liturgies.