Sigmund Freud was the Austrian neurologist who is considered to be the founder of psychoanalysis. Freud also contributed greatly to the analysis of dreams and sexuality. Freud's work remains very popular and relevant today. In Group Psychology and Analysis of the Ego, Freud questions why the psychology of a group, such as an army, church, or mob, can be so strong that the individuals' own personal interest and beliefs can be drowned out.