"It was written by a psychoanalyst named Wilhelm Stekel."

Wilhelm Stekel is the second psychoanalyst and disciple of Freud that Salinger includes in The Catcher in the Rye (the other being Alfred Adler).  

That Stekel's most famous work was a book on sexual fetish, and that he died by suicide (at age 74), may be relevant to Salinger's themes.  Stekel also pioneered the idea of short-term analysis, which he called "active analysis," a precursor to contemporary counselling and therapy.