At the outbreak of World War I, Żeleński was conscripted into the Austro-Hungarian Army and served as medic to railway troops.
After the war, he returned to Poland and, in 1922, moved to Warsaw.
He did not return to his medical practice but instead focused entirely on writing.

Working for various dailies and magazines, Boy-Żeleński soon became one of the authorities of the Polish liberal and democratic intelligentsia.
He criticized the two-faced morality of the clergy, promoted the secularization of public life and culture, and was one of the strongest advocates for the equality of women.
He was one of the first public figures in Poland to support the women's right to legal abortion.
Also, Boy-Żeleński often fought in his essays against the Polish romantic tradition, which he saw as irrational and as seriously distorting the way Polish society thought about its past.

In addition, Boy translated over 100 classics of French literature, which ever since have been considered among the best translations of foreign literature into Polish.
In 1933, Boy-Żeleński was admitted to the prestigious Polish Academy of Literature.
At the outbreak of World War I, Żeleński was conscripted into the Austro-Hungarian Army and served as medic to railway troops. After the war, he returned to Poland and, in 1922, moved to Warsaw. He did not return to his medical practice but instead focused entirely on writing.
Working for various dailies and magazines, Boy-Żeleński soon became one of the authorities of the Polish liberal and democratic intelligentsia. He criticized the two-faced morality of the clergy, promoted the secularization of public life and culture, and was one of the strongest advocates for the equality of women. He was one of the first public figures in Poland to support the women's right to legal abortion. Also, Boy-Żeleński often fought in his essays against the Polish romantic tradition, which he saw as irrational and as seriously distorting the way Polish society thought about its past.
In addition, Boy translated over 100 classics of French literature, which ever since have been considered among the best translations of foreign literature into Polish. In 1933, Boy-Żeleński was admitted to the prestigious Polish Academy of Literature.
Tadeusz Boy-Żeleński