The advances in infant research ignited many of the clinical and theoretical conceptualizations that evolved over the course of Dr. Lichtenberg’s productive career. New ways of thinking about the infant experience of early life brought into question fundamental psychoanalytic propositions such as those that related to the development of a sense of self, motivational systems, and the patient/analyst relationship. The findings from infant research that led to the shift in Dr. Lichtenberg’s thinking from traditional thought are elaborated.