His real name was Mikołaj Dolanowski, but he used pseudonym Jerzy Hryniewski as member of the secret Polska Organizacja Wojskowa before reinstating of Independence. Later it became his legal name.
From 1928 to 1932 he was a secretary of ruling party during Sanacja period – BBWR. He also served as Member of Sejm (1930–1935) and deputy Minister of Interior (1932–1934).