As of my knowledge cutoff date in early 2023, Karen Fortunati is an American author known for her work in young adult fiction. Her debut novel, "The Weight of Zero," received critical acclaim for its sensitive portrayal of mental health issues, particularly bipolar disorder. The story focuses on a teenager named Catherine who struggles with her diagnosis and the stigma associated with it but finds hope and support through treatment and her relationships. Fortunati's work has been praised for its authenticity and contributions to the conversation about mental health in young adult literature. Prior to her writing career, she had experience in the legal field, which influences her perspective in storytelling. It's advisable to check current sources for the most up-to-date information on her work and career.