Gerhard Merz (born 1945) lives as an author and journalist in Munich. He has published numerous books on traditional customs, oracles and dream interpretation, such as "100-year calendar", "The big household book for the whole family" and "The secret knowledge of a modern witch". He has written articles and series in a wide variety of genres for magazines and newspapers, as well as crime novels and short stories. He is particularly interested in calendars, natural medicine and traditional traditions.