Jonathan fell in love with american cinema early on. He often went to the movies with his father, Jean Helpert, a french screen writer. His room was filled with movie posters and he trained every day to master the crane kick from « The Karate Kid ». At a young age he was already writing short films and watching many behind the scenes documentaries of the movie industry. It was his own early film school. After getting his high-school diploma, his father bought him a small camera which he used to direct his first short movies. His shorts were often selected and awarded in many festivals.