 In 1981, during the period of martial law introduced by the Jaruzelski government, Iwiński was appointed to the post of assistant professor at the Polish United Workers Party Central Committee's Higher School of Social Science (Wyższa Szkoła Nauk Społecznych KC PZPR).In 1977–1978 he was a Fulbright Scholar (at Harvard University) and he obtained a second scholarship from the International Research & Exchanges Board (IREX) in 1988, becoming a scholar at the University of California, Berkeley.In the 1980s he was a scholar at the United Nations University in Tokyo.