Flora Rheta Schreiber (April 24, 1918 – November 3, 1988), an American journalist, was the author of the 1973 bestseller Sybil, the story of a woman (identified years later as Shirley Ardell Mason) who suffered from dissociative identity disorder. Ms. Schreiber was an English instructor at the John Jay College of Criminal Justice. Her earlier book was Your Child's Speech. Her last book The Shoemaker was the true story of a mass murderer who suffered from schizophrenia.