Radek Sidun devotes himself primarily to fonts and typography. His graduation thesis at the UMPRUM Academy of Arts, Architecture & Design dealt with the issue of diacritics in world languages. As a result, he is a sought-after consultant to font designers and type foundries the world over. He served as a pedagogue at the Type Design and Typography studio of the UMPRUM Academy in Prague. Together with Tomáš Brousil, he founded Briefcase Type Foundry in 2012. He is also a member of the editorial and design team of the TYPO9010 book and the book about Czech typographer Jaroslav Benda. His latest book project is the Manual of Diacritics, to be published out in December 2021.