Ulrich Renz was born in Stuttgart, Germany, in 1960. After studying French literature in Paris he graduated from medical school in Lübeck and worked as head of a scientific publishing company. He is now a writer of non-fiction books as well as children's fiction books. Barbara Brinkmann was born in Munich, Germany, in 1969. She grew up in the foothills of the Alps and studied architecture and medicine for a while in Munich. She now works as a freelance graphic artist, illustrator and writer.