A defence mechanism is an unconscious psychological mechanism that reduces anxiety arising from unacceptable or potentially harmful stimuli.Defence mechanisms may result in healthy or unhealthy consequences depending on the circumstances and frequency with which the mechanism is used.
Definition from Wikipedia – Defence mechanisms
Sigmund Freud ( FROYD; German: [ˈziːkmʊnt ˈfʁɔʏt]; born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst.Freud was born to Galician Jewish parents in the Moravian town of Freiberg, in the Austrian Empire.
Definition from Wikipedia – Sigmund Freud
Anna Freud (3 December 1895 – 9 October 1982) was an Austrian-British psychoanalyst. She was born in Vienna, the sixth and youngest child of Sigmund Freud and Martha Bernays.
Definition from Wikipedia – Anna Freud