Her fans--and she has many--love Gayle Forman for her tear-jerking books about teenagers living through life-changing experiences. The free-spirited child of supportive, unconventional parents, Forman spent years traveling the world as a young woman. Though Forman is now a major YA novelist, she started out as a journalist. Her first big success was the novel If I Stay, which was subsequently made into a movie starring Chlo? Grace Moretz. The novels...