In 1960 he finished studies at the history department of the University of Warsaw. In 1966 Paczkowski defended his doctorate thesis, and was habilitated in 1975. In 1990 he was given the professor degree.
In 1974-1995 (for 7 terms) he was a president of the Polish Mountaineering Association (Polski Związek Alpinizmu).
Works
Prasa polonijna w latach 1870-1939: zarys problematyki (1977)
Prasa i społeczność polska we Francji w latach 1920-1940 (Press and the Polish Community in France 1920–1940) (1979)
Prasa polska w latach 1918-1939 (Polish Press 1918–1939) (1980)