A graduate of Candler School of Theology in Atlanta, Yambasu taught in many schools, including the denomination's Harford School for Girls in Moyamba. He also was the Sierra Leone Conference's director for Christian education and youth ministries and founded the Child Rescue Centre in Sierra Leone, serving as its executive director until he became a regional missionary in 2000.

He is survived by his wife, Millicent, and five children — Rebecca, Adima, John, Emmanuel and Elizabeth.

He taught Systematic Theology in many institutions of higher learning, including Africa University where he served as founding Dean for almost fourteen years, with a certificate awarded for ten years of pioneer service to the University. Before moving to Africa University in Zimbabwe, he served also as Dean and then as President of the Protestant Interdenominational Seminary in Kinshasa for twenty one years. David Yemba is author of several articles in theological journals and of various church documents and reports.

As to pastoral ministry, he served as chaplain of Katubue United High School and as one of the pastors of the International Protestant Parish of Kinshasa. He was Administrative Assistant to the Bishop in the West Congo Annual Conference. David was elected delegate to the Africa Central Conference in 1972, 1980, 1984 and 1988 and to the General Conference in 1992. He also served as member of the African Church Growth and Development Committee of the GBGM.
The Congo Central Conference elected him to the episcopacy on February 12, 2005. He was re-elected in 2008.

In addition to teaching and administrative duties, David has served as member of the following learning societies and national institutions: National Executive Board of Bible Society in the Congo, Oxford Institute of Methodist Studies and Editorial Board of Quarterly Review with, for the latter, a certificate of recognition awarded. He was elected President of the Association of Theological Institutions in Francophone Africa, Vice President of the World Methodist Historical Society for Africa and Moderator of Faith and Order Commission of the World Council of Church, 1998 – 2006. He was also elected National President of the Civil Society of Churches and Religious Confessions in the Congo and, in that capacity, Vice President of the National Board of Ethics and Election.
Henriette K’Untu and David K. Yemba were married on August 24, 1969, at Wembo Nyama Mission. They have five children: Rosalie Ogar, Hélène Ngoy, Emmanuel Yemba, Joseph Yemba and Benjamin Yemba. They also have three grandchildren: Alexandra Ogar, David Ogar and Jonathan Ngoy.

Bishop Ntambo worked as Assistant Legal Representative of North Shaba for sixteen years (1977-1993). He occupied the following positions: Executive Committee Vice-President; Secretary for Swahili-speaking people at the North Shaba Annual Conference; General Board of Global Ministries director; interpreter at the 1992 General Conference in Louisville; chairperson of the North Shaba Aviation Committee, Construction Committee, Ordained Ministry Committee; IPIM in the country of Burundi (1993-on as D.S., Supervisor and spiritual coordinator for refugees).

Bishop Ntambo planted about 157 churches in the region of Bukuma and Lubudi. He opened two congregations in Nairobi. During his ministry he visited the following countries in order to fulfill his tasks: Zimbabwe, Kenya, Uganda, Tanzania, Somalia, Senegal, Zambia, U.S.A., Israel, Angola, Gambia, and South Africa.
He was elected to the episcopacy in 1996 and served the North Katanga Area, Democratic Republic of Congo until his retirement. He is married to Nshimba Nkulu; they have eight children (three boys and five girls)

Emílio J.M. de Carvalho returned to Angola and was appointed at Central Church in Luanda. In 1965 he became a professor and principal of Emmanuel Theological Seminary in Dondi, Angola. On January 2, 1966, at the Angola Annual Conference, he was ordained elder by Bishop H. P. Andreassen.

At the Africa Central Conference session held in Limbe, Malawi, in August 1972, Emílio J.M. de Carvalho was elected to the episcopacy and assigned to the Angola Area. He was consecrated by Bishop Escrivao A. Zunguze on the 21st of October of that year, in Luanda. He retired September 1, 2000.
He is married to Marilina de Carvalho and they have three children: Arí César, Eunice Paula, and David Mauro.