Jonas is a comic book artist and a musician.
He's the co-creator of 'Pussycat Assassins' (Playboy, 2018 – ongoing) and the sole creator of 'KIWI' (Primus, 2009; Albatros, 2017), 'The Empress' (Playboy, 2018 – ongoing), and 'Kitty Style' (Playboy, 2018 – ongoing) and the writer and artist on 'Kapsy'  (Euromedia, 2018) the comic book adaptation of Karel Čapek's Povídky z jedné a druhé kapsy. Jonas also was the head artist on a graphic novel about the holy roman emperor Charles IV. – 'Karel IV. Pán světa' (Albatros, 2016).
Jonas is probably best known for designing his sister's (the double Olympic Gold medalist and a multiple World Champion – Ester Ledecka) racing suits and creating her trademark superhero look.
Jonas currently works with Martina Kutalkova who colors his art.