Muna was elected President of the Cameroon Bar Association in May 1986, a position he retained until 1992.
He was then named United Nations Country Rapporteur for penal reform and crime prevention in 1987, and elected President of the newly created Central African Lawyers Union (UNAAC).
Bernard Muna was appointed Deputy Prosecutor of the International Criminal Tribunal for Rwanda on 29 April 1997.
In 2013, Bernard Muna was appointed by the UN Secretary General to the UN Commission of Inquiry on the situation in the Central African Republic.
[4] Bernard Muna announced his candidacy for President of the Republic of Cameroon, which was held in 2011.