Around 1954, his family was expelled to Burundi due to his father's involvement in the Mouvement national congolais-Lumumba and the Kitawala politico-religious movement, which opposed the Belgian colonial regime.

In 1978, Pierre Lumbi Okongo decided to return to his country (Democratic Republic of the Congo) and chose to reorganize rural farmers by creating "Solidarité paysanne" in the city of Uvira in 1980, the very first secular Non-governmental organization (NGO) in the DRC.

Among the key activities of "Solidarité Paysanne" are: Throughout his social engagement, Pierre Lumbi Okongo participated in international debates on the exploitation of the Third World, including the "Campaign: mieux se nourrir, vaincre la fin" in the 1980s.

[8] Launched in April 1991 at the Bondeko Center in Limete (Kinshasa), the "Mouvement de la Société Civile" became involved in advocating for the organization of a National Sovereign Conference (conférence nationale souveraine) (CNS).

To ensure this forum, a symbol of the fight against dictatorship for democracy resumed its work, Pierre Lumbi Okongo initiated the "Lay Coordination Committee," a group of Christian laypeople, which organized the "March of Hope" on February 16, 1992.

[9].This march, which was violently suppressed by Mobutu's forces and became the largest peaceful protest ever organized in the DRC With an estimated 2 million participants nationwide, it symbolized the people's demand for democracy and good governance, marking a pivotal moment in Congo's pro-democracy movement.

Pierre Lumbi Okongo was appointed director-general of studies and strategies at the presidency and participated in the Inter-Congolese Dialogue in South Africa (2002–2003).

During this time, he also served as chief of staff and assistant to the special security advisor to the head of state, Samba Kaputo.

Among his last contributions as secretary-general of Ensemble pour la République, Pierre Lumbi Okongo called on Congolese citizens to unite in fighting COVID-19, urged politicians to avoid controversy and work together to combat the pandemic, and demanded transparency from the government regarding concrete measures implemented in Kinshasa and provinces to mitigate the socio-economic impacts of COVID-19.