The subject of the paper is life and achievements of Prof. Andrzej Witold Danysz (born 1924), Doctor Honoris Causa of the Medical University of Białystok, lieutenant‑colonel of the Armed Forces of Poland, a meritorious pharmacologist, a pioneer of pharmacoradiobiology and a university lecturer, from whose handbooks already the fourth generation of students, physicians and pharmacists has been learning. The paper presents the Professor’s lineage, the course of his education and the first years of his clandestine medical studies during the German occupation (1942–1944), underground activity and his participation in the Warsaw Uprising of 1944. Moreover, his Krakow, Jagiellonian University (UJ) medical studies (1945–1948) and scientific work for the UJ’s Pharmacology Department, crowned with winning of the doctor’s degree are described. Circumstances of his call to arms and his lecturer’s job at the Military Centre of Medical Education in Łódź (1950–1957), that initiated Professor’s activity as a lecturer, author and co‑author of over a dozen handbooks on pharmacology and related sciences, published and updated many times, are also discussed. Memories of a student attending the unforgettable, masterly lectures of Professor Danysz from a period of his brief work (1963/1964) at the Military Academy of Medicine in Łódź were recalled.