He was an associate of "Po Prostu" (1955-1956), and then a member of the editorial staff of "Przegląd Kulturalny" (1955-1962) and "Kultura" (1965-1981).
Osęka was a member of the Association of Polish Journalists and the Polish Writers' Union, and a collaborator of the Experience and Future Conversatory (for example, he prepared the chapter on Social Behavior for the report Poland towards martial law in 1982).
From 1980 Osęka was a member of NSZZ "Solidarność", and was active in the Team for Culture of the Mazovia Region of the union.
He collaborated with Kultura under the pseudonym Paweł Morga and with the underground press in Poland (including Tygodnik Mazowsze).
[2] In 2011, President Bronisław Komorowski decorated Osęka with the Knight's Cross of the Order of Polonia Restituta.