13 Reasons Why is an American teen drama television series developed for Netflix by Brian Yorkey and based on the 2007 novel Thirteen Reasons Why by author Jay Asher. The series revolves around high school student Clay Jensen and the aftermath of the suicide of fellow student Hannah Baker. Before her death, she leaves behind a box of cassette tapes in which she details the reasons why she chose to kill herself as well as the people she believes are responsible for her death.

Brian Yorkey is an American playwright and lyricist. His works often explore dark and controversial subject matter such as mental illness, grief, the underbelly of suburbia, and ethics in both psychiatry and public education.