Ondřej Neff is a Czech science fiction writer and freelance journalist, publisher of the online diaries Neviditelný pes (founded 1996) and DigiNeff (about digital photography, 1999). Neff’s latest book is Ultimus, a novel set in a prison on the other side of the moon. He appeared as an actor in the legendary Czech horror film by director Marek Dobeš, Choking Hazard.