High Quality Content by WIKIPEDIA articles! Dr. Jeffrey Moussaieff Masson (born March 28, 1941 as Jeffrey Lloyd Masson in Chicago, Illinois) is an American author, residing in New Zealand. Masson is best known for his conclusions about Sigmund Freud and psychoanalysis. In his book The Assault on Truth, Masson argues that Freud may have abandoned his seduction theory because he feared that granting the truth of his female patients` claims that they had been sexually abused would hinder the acceptance of his psychoanalytic methods. He is a vegan and has written about animal rights.