Master in History, University Warsaw, 1955. Doctor of Philosophy, University Warsaw, 1960. Doctor of Science, University Warsaw, 1967.
From assistant to associate professor, U. Warsaw, Poland, 1955-1974; professor of history, U. Warsaw, since 1974; dean history faculty, U. Warsaw, 1981-1987; vice rector, U. Warsaw, 1975-1981; director institute history, U. Warsaw, 1987-1993.
Member Polish History Society, Polish Academy of Sciences (history science committee since 1993).
Son of Henryk and Kazimiera (Wolsa) L. Married Alina Szczecinska, April 8, 1947 (deceased November 1992). Children: Andrzej, Joanna.