Polish writer, journalist and adventurer, studied philosophy and natural science at the Jagiellonian University in Kraków and later in Poznań and the University of Leipzig. Took part in the Greater Poland Uprising in 1918, was one of the organizers of the Polish Military Organisation from 1918 to 1920. He travelled to Mexico, Indochina, Brazil, Madagascar, West Africa, Canada and United States, amongst other countries. He wrote 32 books that have been translated into 23 languages and sold over 10 million copies in total. His most famous and popular book, written in 1942, was "Dywizjon 303" (Squadron 303) about the legendary Kościuszko Squadron fighting during the Battle of Britain; it sold over 1.5 million copies.