Coming from a peasant family living in the back country, Pająk nevertheless went on to study philology at the Maria Curie-Skłodowska University in the city.
He then became teacher of Polish language in a gymnasium and contributed to a farm newspaper in Lublin (Sztandar Ludu).
In 1969, he compiled Henryk Cybulski's memoirs, Czerwone noce (Red nights) about Przebraże Defence, the self-defence of Poles against the Ukrainian UPA.
A prolific writer, Henryk Pająk wrote many novels and poems which made him notable locally such as Druga śmierć (Second death) in 1971, Tam, za snem (There, for sleep) in 1991 (received 2 literary awards) or Wolny (Free) in 1992.
Since, he has written many books, such as a book about the Polish communist regime in 1997 (Rządy zbirów 1940-1990 [Governments of criminals]), written with Stanisław Żochowski (one of the NSZ confunders), or a biography of Józef Piłsudski (Ponura prawda o Piłsudskim [Gloomy truth about Piłsudski], in 2005).