Siobhan Vivian is a bestselling American novelist, editor, and screenwriter. She is known for her compelling young adult novels that often explore themes of identity and self-discovery. Her works include The Last Boy and Girl in the World (April 2016), The List, Not That Kind of Girl, Same Difference, and A Little Friendly Advice. In collaboration with her best friend Jenny Han, she co-wrote the Burn for Burn series.

Siobhan was born on January 12, 1979, and she currently resides in Pittsburgh. Her books have been well-received by readers and critics alike, making her a prominent figure in the realm of contemporary young adult literature.