After returning to Poland in March 1921, he continued his education at the Kazimierz Kulwieć Middle School in Warsaw, where he received his maturity diploma in June 1922.

Kamiński then studied history at the Faculty of Philosophy of the University of Warsaw and received his master's degree in January 1928.

From 1929 he worked as a history teacher at Saint Stanislaw Kostka Gymnasium in Warsaw, and from 1930 to 1931 he was the head of the boarding house of the Union of Military Settlers for the youth of vocational schools at Młocińska Street.

Author of novels, which were also methodological manuals for instructors of the ZHP Scouts: "Antek Cwaniak" (1932), "Książka wodza zuchów" (1933) and "Koło rady" (1935).

He became the initiator, organizer and then editor-in-chief of the "Information Bulletin"[1] (issued weekly since 5 November 1939 by the Warsaw-City District SZP-ZWZ-AK, and since spring of 1941 by the Home Army Headquarters, the most important conspiratorial newspaper in occupied Poland – circulation up to 47 thousand).

2), under the alias "Hubert", Kamiński published an article "Podstawy ideowe propagandy wojskowej" (The Ideological Basics of Military Propaganda).

He organized and then supervised the work of the Propaganda Commission (KOPR), which since spring of 1942 had been producing the entire publishing output of the Home Army Warsaw District Headquarters.

At the same time, from 1941 until the outbreak of the Warsaw uprising, under the alias "Hubert", Kamiński was a counterintelligence officer in the unit II of the Main Headquarters of ZWZ-AK.

Creator of the concept, founder and since December 1940 commander-in-chief of the Small Sabotage Organization "Wawer" under the pseudonym "Dąbrowski".

The best known and most visible effects of Wawer's activity include drawings of the "anchor" of the Fighting Poland and "V" signs, as well as anti-German inscriptions in public places, distribution of leaflets, gassing of cinemas and megaphone actions.

Kamiński is the author of one of the most famous books of occupied Warsaw, "Kamienie na szaniec" (Stones for the Rampart), which was first published in July 1943.

He wrote the book on the basis of Tadeusz "Zośka" Zawadzki's account of his colleagues from the 23rd Warsaw Scouting Team, including Jan Bytnar and Aleksy Dawidowski, written after the Operation Arsenal in April 1943.

He was the author of The Great Game, the first edition of which was destroyed in 1942 by order of the Home Army Main Command as it was revealing the methods of underground combat.

Manual for Branch Managers of Zawisza") (part 1–2, December 1942, edition II 1943, edition III 1944).In April 1944, Kamiński was placed by the counterintelligence of the National Armed Forces (NSZ) on one of the so-called proscription lists, which included the names of people suspected of being leftist, Communist and/or Jewish in origin.

[3] During the Warsaw Uprising he continued to be the editor-in-chief of the "Information Bulletin", which at that time was already published openly as a daily newspaper, until the last issue on 4 October 1944.

Kamiński returned to scouting in 1956, when the events of October 1956 brought renewal and hope for democratic change in the country.

At the beginning of the 1970s, on the order of the authorities, Kamiński prepared a report on the consequences of possible introduction of work-free Saturdays.

[8][1][9][10] On 22 February 2008, on the Fraternal Thought Day, during the celebrations connected with the honorary patronage of 5 scouting organizations, the President of the Republic of Poland Lech Kaczyński posthumously awarded Aleksander Kamiński the Commander's Cross of the Order of Polonia Restituta.

[15] In 2014, Kamiński was a patron of the Łódź ZHP Banner, the Youth Palace in Katowice, 15 schools and 27 strains, teams and scout troops.