His most famous works include Křemílek and Vochomůrka, Rumcajs and Víla Amálka.
[1][2] Čtvrtek was born on 4 April 1911 in Prague, Austria-Hungary, however, he spent a part of his childhood in Jičín, the town which later became the setting for his stories and fairy tales.
[3] Initially, he worked as a clerk, and only after World War II he began contributing to the children's magazines, such as Mateřídouška [cs] and Ohníček.
[4] In 1949, he was engaged as a dramaturgist in the Czechoslovak Radio, where he participated in broadcasting for children and youth.
In collaboration with illustrator Radek Pilař and voice actors Karel Höger, Vlastimil Brodský, Jiřina Bohdalová and Jiří Hrzán he created some of the most popular cycles of the television programme Večerníček.