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.