Sigmund Freud (1856–1939), the Austrian psychoanalyst and founder of psychoanalysis, spent a lot of time studying various mental traumas suffered in childhood. According to Freud, every person carries these traumas within himself and they have a decisive influence on his life. Freud's theory was developed and supplemented by Erik Erikson (1902-1994), a German psychologist and psychoanalyst who liv...