[1] Choynowski studied chemistry originally, in Warsaw and in Lwów (now Lviv), then from 1908, history and philosophy in Zurich and at the Jagiellonian University in Kraków.
In 1914 during World War I he joined the Polish Legions (Legiony Polskie) to fight for Poland's independence, but his poor health forced him to quit.
In his prose, he focused on the life of Polish upper classes, inspired by writings of Henryk Sienkiewicz.
In 1953, during Polish Stalinism one of his stage plays was revived temporarily called Ruchome piaski (Shifting Sands, from 1913).
In 1988 his novel W młodych oczach (In the Young Eyes, 1933) was reprinted, and in 1991 another one, called Młodość, miłość, awantura (Youth, Love and Disturbance, from 1926).