Erik Salomonsen, later known as Erik Erikson, struggled with his identity and the mystery of his biological father throughout his life, believing variously that his father was his mother's husband or another man who had abandoned her. He became a prominent figure in psychoanalysis, introducing the concept of the identity crisis and extending Freud's theories into adulthood while emphasizing social and historical influences. Despite his successes, he grappled with personal problems, including complex family dynamics and a search for belonging, ultimately reflecting his lifelong quest for identity.