 In 1956, when the sociological department in Warsaw re-opened, Szacki returned there to obtain a Ph.D. degree.He wrote his thesis at the "Institute for the Education of Research Staff" "(Instytut Kształcenia Kadr Naukowych)", which was attached to the Central Committee of the Polish United Workers' Party and was soon afterwards renamed to "Institute for Social Sciences" "(Instytut Nauk Społecznych)", whose director at the time was Bronisław Baczko.Szacki completed his habilitation at the department of philosophy in 1965.