Bruno Hächler grew up in the Zürcher Oberland, the hilly region outside of Zurich, Switzerland. He has worked as a typesetter, a newspaper editor, and a music journalist.? In Bruno Hächler's songs and stories, mischief and poetry go hand in hand. Hächler has written numerous children's books that have been translated into many different languages. He has also put out a slew of albums of children's music, many of which have reached the Swiss charts. His album "Langi Ohre" was selected by an all-child jury to receive the Lollipop Award for best children's album. Today Hächler is a full-time writer of children's songs and children's books. He lives in Winterthur, Switzerland.

Birte Müller was born in Hamburg in 1973. She studied illustration at the University of Applied Sciences for Design in Hamburg. In 2002, her thesis was awarded first prize for the best diploma thesis of the year. She organizes workshops for children all over the world. Birte Müller has been working as a freelance illustrator in Hamburg since 1999.