Tassoua was a militia commander during the 1997 civil war and served in the government of Congo-Brazzaville as Minister of Energy and Hydraulics from 1997 to 2002.
He has been the President of the Economic and Social Council, a state institution, since 2009[1] and he was Co-President of the New Democratic Forces (FDN), a political party, from 2007 to 2010.
[20] After serving as First Vice-President of the Economic and Social Council, Tassoua was appointed as its president by Sassou Nguesso on 18 September 2009.
Speaking to the press on 12 October 2009, Tassoua discussed his plans for improvements to the Council's work, mainly focusing on increasing the visibility of the institution through greater openness and accessibility.
Tassoua reiterated that the Council had an important role to play in the nation's political life as "a center of reflection" assisting the decision-makers.
[24] The party congress also saw the establishment of the High Council of Dignitaries, a consultative body intended to advise the FDN Executive Bureau; Tassoua was included as one of its seven members, and it was installed on 1 June 2010.
[28] According to Tassoua, armed men attacked his home in Impfondo on the night of 22–23 September 2014 intending to kill him, but he was not there at the time.
[29] Speaking about the attack at a press conference on 15 October 2014, Tassoua stressed that he was "no longer interested in active politics" and said that he devoted his free time to farming.