Popularly known as "The Gentleman of African Cinemas", Mensah contributed in several critically acclaimed documentaries including Équateur, Les Couilles de l'éléphant and Lybek, the crunch of the alive.
Along with renowned filmmaker Henri-Joseph Koumba Bididi in 1995, Mensah involved in the television serial L'Auberge du Salut, a full Gabonese film.
[1] As executive producer, Mensah participated in numerous productions including: Le Damier de Balufu Bakupu Kanyinda in 1996, Dôlè (l'Argent) by Imunga Iwanga in 2000, Les Couilles de l'éléphant in 2001 and N'Djamena City directed by Issa Serge Coelo in 2006.
In the same year, he became the president of Pan-African Federation of Filmmakers (FEPACI) as well as in Film Assistance Fund Commission of the International Francophone Organization.
In 2011, he worked in Bididi's Le collier du Makoko which gained international recognition including Cannes inclusion.