His family owned properties and apartment houses in Wilno, in the Russian part of Poland.

[3][4] Jędrychowski graduated from Stefan Batory University in Wilno in 1932 with degrees in law and social science.

[4][5] He began his political career as a radical leftist in a group called the Renaissance (Polish: Odrodzenie) as an undergraduate student.

[4][6] Then he was named deputy editor of the local communist daily which had been published by the Soviet authorities.

[4] Later Jędrychowski continued his activities in the Polish Committee of National Liberation (PKWN), which was formed on 22 July 1944.

[10] Jędrychowski served as the vice president or deputy prime minister at the Polish cabinet, also known as Rada Ministrów, from 12 December 1951 to 24 October 1956.