He served as Gabon's Ambassador to Germany and was later the Secretary-General of the Gabonese Union for Democracy and Development (UGDD), an opposition party.
[5] Ratanga briefly went on hunger strike in December 2005 to protest his inability to obtain a passport from the government, which would enable him to visit his family living abroad.
[6] President Omar Bongo appointed Ratanga, who was still serving as the Secretary-General of the UGDD, to the government as Minister of Transport and Civil Aviation on 14 January 2009.
Speaking at a ceremony for the installation of new aviation and transport officials on 6 February 2009, Ratanga stressed the importance of innovation and performance.
Ratanga and Ndiaye met with Julien Nkoghe Bekale, the Minister of Oil, on 29 October 2009 to discuss their plan for repairing SOGARA's finances.