Audiotapes of recorded conversations between Schreiber and Wilbur were examined by Herbert Spiegel and later by John Jay College of Criminal Justice academic Robert W. Rieber. Both professionals concluded that Wilbur suggested multiple personalities to her client, whom they saw as a simple "hysteric". Their purported proof of this claim is a session tape in which Wilbur is heard describing to Mason the personalities she has already seen Mason exhibit. Spiegel and Rieber also claim that Wilbur and Schreiber fabricated most of the book. Many details of the real case were changed or removed to protect Mason's privacy.