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Zbigniew was the son of Zbigniew Bąk of Gora and Catherine of Trzycierz. Zbigniew was destined for a secular career. We know nothing about his education. Probably, like other sons of magnates, he was educated in knightly crafts. He took part in an expedition against Turkey in 1443, but did not participate in the Battle of Varna. He took part in the Thirteen Years' War against the Teutonic Knights. He entered into negotiations with the Chojnice garrison, but failed to achieve the seizure of the town. From the Grand Master Ludwig von Erlichshausen, he obtained the glytes for Jan Bażyński representing the Prussian states. For his services to King Casimir Jagiellon, he received the castellany of Maloga in 1462. He returned to service in diplomacy. In 1465, he sent to King George of Poděbrady of Bohemia in connection with a dispute between the Polish king and Konrad IX the Black, Duke of Oleśnica and Kozietuly, over the Rawska, Gostymin and Bełz lands, inherited from the deceased Mazovian dukes. In the summer of 1466. The seal of Zbigniew Bąk is among 114 seals on the deed of the Second Peace of Toruń dated 19 October 1466. He sent to Prague to explain the reasons for the robber barons' plundering of Częstochowa by Scibor Towaczowski of Czimburk. Upon his return, he was given the office of Castellan of Ripiersk. His last diplomatic mission was a dispatch to the court of Frederick II, Elector of Brandenburg. The issue was the succession of Szczecin, for which Sophia, wife of Duke Eric II of Slupsk (the only marriage between two Griffins in the history of the dynasty), was competing with the Brandenburg Elector. This mission ended with the conclusion of a truce. After completing his mission, he returned to the castellany of Rozpier, which again reverted to Zadors years later (after the death of Hinczka from Rogów, his father also became castellan of Rozpier, and thus he found himself in the Crown Council). The last mention of Zbigniew Bąk as a living person dates from 30 May 1469. Zbigniew's wife was Małgorzata from Bnin of Łodzia coat of arms, daughter of Piotr, Castellan of Gniezno, and his second wife Elżbieta from Gułtów of Grzymała coat of arms. This marriage produced two daughters: Zuzanna and Małgorzata.
