Anonymous user comment: “I was initially drawn to this by the typographical design and also because of my general interest in Situationism. It was therefore a pleasant surprise on opening the pamphlet to discover a woman member of the Situationists who I had not heard of before – Jacqueline de Jong.”
Wikipedia says this about her:
She joined the Situationist International in 1960, and started to participate in conferences and the Central committee. After the expulsion of Constant Nieuwenhuys and his group, she became the Dutch Section of the organization. She did not accept the way the German section, also known as Gruppe SPUR, had been expelled and resigned. The cleft between the Debordists and the Second Situationist International grew, however she refused to join either faction, instead stating that people should act as situationists. Between 1962 and 1968 she edited and published the The Situationist Times involving Gaston Bachelard, Roberto Matta, Wifredo Lam and Jacques Prévert in this project. In 1968 she was in Paris, printing and distributing revolutionary posters.