Kušan was born in Sarajevo, Kingdom of Yugoslavia to the family of Jakša Kušan, a bookstore owner. The family moved to Zagreb in 1939. At the age of ten Ivan discovered his writing talent and wrote his first novel.
He published his first book in 1956. His specialty became children's novels, and some of them, like Lažeš, Melita and Koko u Parizu, became very popular. In the later stages of his writing career, Kušan found a taste for erotic fiction. He also wrote a novel about famous outlaw Jovo Stanisavljević Čaruga, later adapted into 1991 motion picture.
Books by Ivan Kušan
Kušan published four short story collections and fifteen novels, but he is best known for his children books. He wrote one short story collection, Strašni kauboj consisting of 30 stories usually 5-10 pages long. Other children books are eight novels. These are in chronological order: Uzbuna na Zelenom Vrhu, Koko i duhovi, Domaća zadaća, Zagonetni dječak, Lažeš, Melita, Koko u Parizu, Ljubav ili smrt and Koko u Kninu. His most famous book is Koko u Parizu. It has been adapted for a theatre play and a film.
- Zajović, Milena (2012-11-20). "Književnik Ivan Kušan preminuo u 80. godini" (in Croatian). Večernji list. Retrieved 20 November 2012.
- Kušan, Ivan (1996). "Note about the Author". Koko u Kninu (in Croatian). Zagreb: Znanje. p. 245. ISBN 953-6473-16-X.
- "Koko u Parizu". Zagreb Youth Theatre (in Croatian). Retrieved 24 December 2016.