The World Council of Churches (WCC) is a worldwide Christian inter-church organization founded in 1948 to work for the cause of ecumenism. Its full members today include the Assyrian Church of the East, the Oriental Orthodox Churches, most jurisdictions of the Eastern Orthodox Church, the Old Catholic Church, the Lutheran churches, the Anglican Communion, the Mennonite churches, the Methodist churches, the Moravian Church, Mar Thoma Syrian Church and the Reformed churches, as well as the Baptist World Alliance and Pentecostal churches. Notably, the Catholic Church is not a full member, although it sends delegates to meetings who have observer status. The WCC describes itself as "a worldwide fellowship of 349 global, regional and sub-regional, national and local churches seeking unity, a common witness and Christian service". It has no head office as such, but its administrative centre is at the Ecumenical Centre in Geneva, Switzerland. The organization's members include denominations which claim to collectively represent over 500 million people across the world in more than 110 countries. Many regional affiliates of the World Council of Churches, such as the Middle East Council of Churches and National Council of Churches in Australia, work for the cause of Christian unity at the domestic level, with member denominations including the Oriental Orthodox Churches, Lutheran churches, Catholic Church, Eastern Orthodox churches, Methodist churches, Anglican Communion, Reformed churches, among others. History The Ecumenical Movement met with initial successes in the late 19th and early 20th centuries, including the Edinburgh Missionary Conference of 1910 (chaired by future WCC Honorary President John R. Mott). In 1920, the former Ecumenical Patriarch of the Eastern Orthodox Church, Germanus V of Constantinople, wrote a letter "addressed 'To all the Churches of Christ, wherever they may be', urging closer co-operation among separated Christians, and suggesting a 'League of Churches', parallel to the newly founded League of Nations". Church leaders agreed in 1937 to establish a World Council of Churches, based on a merger of the Faith and Order Movement (under Charles Brent of the Episcopal Church of the United States) and Life and Work Movement (under Nathan Söderblom of the Lutheran Church of Sweden) organisations. Its official establishment was deferred with the outbreak of World War II until 23 August 1948. Delegates of 147 churches assembled in Amsterdam to merge the Faith and Order Movement and Life and Work Movement. This was consolidated by a second meeting at Lund in 1950,