Edward Tronick operates at the interface of empirical analysis of mother–infant communication, systems theories, and psychoanalysis. He has been a leader in the articulation of the implications of systems views for child development research. Systems views of mother–infant interaction, and of development more broadly, increasingly provide one theoretical underpinning for psychoanalysis. His work has enriched our understanding of interactive models of the dyad, of development, and of the mind. He has made a pivotal contribution to the development of a relational systems approach to infant research and its implications for adult treatment.