 Melvin Belli called upon him as an expert witness for Jack Ruby, Lee Harvey Oswald's killer, whom he diagnosed as suffering organic brain damage that most likely involved psychomotor epilepsy.His first publications were on diagnostic psychological testing and included the very influential "Psychoanalytic Interpretation in Rorschach Testing" (1954).He later wrote on psychoanalysis and psychotherapy in works including "Aspects of Internalization" (1968), "A New Language for Psychoanalysis" (1976), "The Analytic Attitude" (1983), "Retelling a Life" (1992), "The Contemporary Kleinians of London" (1997), "Bad Feelings" (2003), "Insight and Interpretation" (2003), and "Tragic Knots in Psychoanalysis" (2009).