Cissa Wa Numbe has been as adviser to the the UN Secretary General's special representative to UN-Africa Union led International Conference for Peace, Security and Development for the Great Lakes Region of Africa.

Cissa served as a panelist during "UN60: A time for Renewal," a gathering of UN advocates at the UN HQ in New York in March 2005. and also served as a judge at the International Service Human Rights nomination Awards 2004 in London, UK; and as a committee member representing African civil society to UN World Summit on Environment and Development 'UNCED' in Rio de Janeiro, Brasil in 1992.

Currently, Dr. Cissa Wa Numbe is the Secretary General of the United Nations Association of the Democratic Republic of the Congo (UNA-DRC). UNA-DRC has three offices located in the cities of Kinshasa, Goma, and Bukavu, D.R. Congo.