One of the most famous Czech Youtubers, who has been filming videos since 2012. In addition to video games, he also shoots vlogs. In 2016 all his videos collected over 89 million views. He is one of the most followed personalities in the Czech Republic on social media and FORBES magazine in 2016 voted him as the most influential person on social media. In addition, the same magazine included him in prestigious selection 30 under 30.
Jirka was able to use his popularity outside of the internet. He sells his own merchandise successfully, and from May 2016 he also publishes his own printed magazine and he runs a game cafe ZETKO with a professional recording studio in Prague. It is available for any creators and also for other Youtubers.