Ida-Marie Rendtorff and Daniel Zimakoff have both written a number of books for children and teenagers. They write together but they have also published books as sole authors. Ida-Marie Rendtorff began to write at an early age, writing a diary and stories as a child. Daniel Zimakoff started to write as an adult on a writing course on a Greek island. They met on a teacher training course for writing in Copenhagen.

Ida-Marie and Daniel give presentations about being authors and what it's like to write together as a married couple.