Graduate of the Film and Television School at Tel Aviv University, Shachar Magen has worked as the editor of Ynet’s Culture section, and directed the documentary films The mother of the Gevatron, Life Stories and Strange Death. In 2006, Keter published his first novel, Black Slaughter, which was nominated for the Sapir Prize for Literature.

He is the creator and main writer for the daily drama series Exposes. He is also the creator and main screenwriter for the drama series The Prime minister's children, and screenwriter for Hagai Levy’s series The Accursed. In 2014, his thriller series, Sirens, was released. The series deals with the siren's myth and has three seasons. The series has a Russian version and now working on American version. He also the creator and main writer of Possessions, a French and Israeli series, which first aired on Canal plus and Yes TV during 2020. The series written with Valeire Zanatti, directed by BAFTA-nominated Thomas Vincent (“Bodyguard”) and was shot in Israel in French, Hebrew and English. The series won the best tv series by the french critics (Syndicat Francais) and also aired on HBO Max.  In 2023 his second novel, "Land Of The Monasteries", was published. The book was nominated for the Sapir Prize for Literature (long list). The book is being adapted into a TV series which is a co-production of Hot and Paramount Plus and will be broadcast in Israel and the USA.