He graduated from Law Faculty at Saint Petersburg State University, after which took a job in a bank at Riga.
In December 1922, Czechowicz, under the pseudonym Leliwa, wrote a book “The Project of Improvement of Polish Treasury”.
The publication criticized the government of Poland, and the author stated that the newly recreated country lacked cohesive tax regulations, and a well-thought out plan of changes.
He analyzed the works of two ministers of treasury, Wladyslaw Grabski and Jerzy Zdziechowski, criticizing the introduction of the złoty, which replaced the mark.
Contrary to Wladyslaw Grabski, who avoided foreign loans, Czechowicz supported them, claiming they were necessary for the economy.
In December 1927, Gabriel Czechowicz handed 8 million zlotys to the official fund of Jozef Pilsudski.
The money was then used in the election campaign of pro-government party, the Nonpartisan Bloc for Cooperation with the Government (BBWR).
Even though Czechowicz followed the orders of Jozef Pilsudski, the Sejm decided that the Minister must face the State Tribunal.
Pilsudski himself wrote a newspaper article “The Bottom of an Eye” (“Dno oka”), in which he presented a favourable picture of his minister.
Among his proposals were a temporary halt of payments of the foreign debt of Poland, limit to the exports and closer control of the cartels.