Anna Freud
and Anna Freud and ego psychology. In America, Anna Freud heavily influenced American psychoanalysis in the 1940s, 1950s, and 1960s. American ego psychology was furthered in the works of Hartmann, Kris, Loewenstein, Rapaport, Erikson, Jacobson, and Mahler. In London, those who refused to choose sides were termed the "middle school," whose members included Michael Balint and D.W. Winnicott. A certain division developed in England between the school of Anna Freud and that of Melanie Klein, which later influenced psychoanalytic politics worldwide. Klein was popularized in South America while A. Freud garnered an American allegiance.