Answer:
Sigmund Freud
Step-by-step explanation:
Freud proposed that if a child experienced anxiety, that was thwarting his or her sexual appetite during any libidinal (psychosexual) development stage, said anxiety would persist into adulthood as a neurosis (a relatively mild mental illness that is not caused by organic disease, involving symptoms of stress (depression, anxiety, obsessive behavior, hypochondria) but not a radical loss of touch with reality), a functional mental disorder.