He was a member of staff and Pentecostal "observer" at the World Council of Churches in 1954 and 1961, respectively, and was invited to serve as Pentecostal representative at the Second Vatican Council.
Lewis was an active Churchman, and served as Chairman of a Standing Committee of the World Council of Churches.
In 1990, he moved to Geneva, Switzerland, working as Editor of the Ecumenical Press Service, a news agency of the World Council of Churches, compiling and distributing news to agencies, publications and electronic media globally.
It has been a member of the World Council of Churches since 1975 and functions as part of the larger worldwide Anglican Communion.
Funds also came from the World Council of Churches, the International Work Group for Indigenous Affairs, the United Nations Association of Denmark, and many others.
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Believes that Christian unity is a spiritual concept, not a man-made organization such as the World Council of Churches or the National Council of Churches.
He represented the Mar Thoma Church in the World Council of Churches at Nairobi and is the recipient of the Manva Seva Award of the Mar Thoma Church.
In April 2008 a delegation of the World Council of Churches toured the country, met with government officials in the north and GoSS officials in the south, and hosted a large nondenominational Christian festival in Juba.
The United Methodist Church’s relationships with other church bodies are also strengthened through the GCCUIC’s membership in the National Council of Churches of Christ in the United States of America (NCCCUSA) and the World Council of Churches (WCC).
As a member of the Central Committee of the World Council of Churches (1961–77), he participated in general congresses at New Delhi (1961), Uppsala (1969) and Nairobi (1975) as well as at the annual sessions of the Central Committee at Paris (1962), Geneva (1966, 1973 and 1976), Heraklion (1967), Canterbury (1969), Addis Ababa (1971), Utrecht (1972), Berlin (1974), etc.
From 1937 onwards he attended all the major ecumenical gatherings related to the formation and establishment of the World Council of Churches including Oxford and Edinburgh (1937), Amsterdam (1948), Evanston (1954), New Delhi (1961) and the annual meetings of the World Council of Churches executive committee once it was set up in 1948.
He taught religion and theology in Makerere University, Uganda from 1964 to 1974 and was subsequently director of the World Council of Churches' Ecumenical Institute in Bogis-Bossey, Switzerland.
One of her main duties was promoting dialogue on homosexuality at the National Council of Churches (USA) and the World Council of Churches.
Recent presenters have included Rev. Dr. Olav Fykse Tveit, General Secretary of the World Council of Churches; Rev. Timothy Radcliffe, OP, former Master of the Order; Rabbi Jack Bemporad of the Center for Interreligious Understanding; Archbishop Luis Ladaria, SJ, of the Congregation for the Doctrine of the Faith, and Mary McAleese, president emeritus of Ireland.
One of his daughters, Sarah Chakko (1905–1954), was principal of Isabella Thoburn College, Lucknow, India, and the first woman president of the World Council of Churches.
Myroslav Marynovych has received many educational awards, including fellowships at Columbia University (USA), the World Council of Churches (Switzerland), and the Catholic University of Nijmegen (The Netherlands).
Prominent examples of external organizations that challenged the PAP during the 1987 ISA arrests are the International Commission of Jurists (ICJ), Amnesty International, World Council of Churches and Asia Watch.
His address to the Third Assembly of the World Council of Churches at New Delhi in 1961, under the title "Called to Witness," delivered few months before his death caught the attention of the large ecumenical church.
In 2005 he joined the World Council of Churches (WCC) in Geneva to run the Ecumenical Accompaniment Programme in Palestine and Israel (EAPPI).
The Rev. Roswell P. Barnes, served as the American leader or U.S. secretary of the World Council of Churches (WCC), serving with the aid of Charles Phelps Taft II - son of President William Howard Taft - who supported the ecumenical movement and Rev. Barnes belief for a need for a blueprint for the Protestant community to affect the world; and to serve as a counterpoint to Catholicism's increasing popular influence led by Archbishop Fulton Sheen.
He attended the meeting of churches adhering to the Presbyterian system at Lausanne in 1920, and participated in the inaugural meeting of the World Council of Churches in Amsterdam in 1948.
He served as a member of the Faith and Order Commission of the World Council of Churches and as a delegate from the Orthodox Church in America to the Assemblies of WCC in Uppsala, Sweden and Nairobi, Kenya.