As a volunteer in the Polish independence movement from 1918 to 1920, Brzeziński saw action in the Battle of Lwów during the Polish-Ukrainian War and against Soviet forces in the final Warsaw campaign of 1920.
He entered the diplomatic-consular service of the new Polish Republic, serving in Essen, Germany; Lille, France; Leipzig, Germany; Kharkov, in the Soviet Ukraine (during the Great Purge on 1 November 1936 – 16 December 1937), and Montreal, where he lived after the Communist takeover in Poland after World War II.
While in Leipzig, Germany, before World War II, Brzeziński became involved in efforts to rescue European Jews from Nazi concentration camps.
In 1978, his efforts on behalf of the Jewish people were recognized by Prime Minister of Israel Menachem Begin.
He was survived by his two sons: Zbigniew Brzezinski, President Jimmy Carter's national security advisor; and Lech Brzeziński, an engineer also living in Montreal.