He notably founded and presided over the Centre for Socio-Political Research and Information (Centre de recherche et d'information socio-politiques, or CRISP), known for its series of working papers entitled Courriers hedomadaires (Weekly Letters) which he created in 1958, together with Jean Ladrière, François Perin, and Jean Neuville.
In the wake of the Second World War, he became editor-in-chief of the Belgian edition of Témoignage chrétien, which placed him in the camp of progressive christians.
[5] He participated in the creation of Esprit groups in Belgium under the auspices of Emmanuel Mounier, with Jean Ladrière, Jacques Taminiaux and François Perin.
They managed to disseminate many sources on Congolese history: the Congo series from 1959 to 1967, suspended by President Mobutu Sese Seko after the establishment of the one-party rule by the Popular Movement of the Revolution.
Others relate to Congo during the Second World War (1940–1945), the period immediately preceding independence (1960), the Mobutu regime (1965–1993), and Laurent-Désiré Kabila (1979–1999), among other subsets.