Petr Zahradník, specialist in the taxonomy of the Ptinidae family (author of approx. 60 taxonomic publications with descriptions of almost 200 species), but he is also devoted to the Bostrichidae family. He is the co-author of a number of descriptions of species of this family, including fossil species. He currently works as a scientific worker-entomologist at the Forestry and Game Management Research Institute, Jíloviště, near Prague.Jiří Háva, specialist in the taxonomy of the family Dermestidae (main focus) and other families (author of approximatly 800 taxonomic publications with descriptions of almost 950 species), but he is also devoted to the family Bostrichidae. He is the co-author of a number of descriptions of species of this family, including fossil species. He currently works as an entomologist at Private Entomological Laboratory & Collection, Únětice, near Prague.