Victoria Charles is a professor of art history. She has published many works and has regularly contributed to Art Information, an international guide to contemporary art. Writing frequently for specialised journals and magazines, Victoria Charles recently contributed to a collective work, 1000 Paintings of Genius. Klaus H. Carl is the author of numerous works on the history of large cities, and is also a well-known photographer of nature.A teacher by profession, he also took part, alongside Victoria Charles, in the writing of 1000 Paintings of Genius.