Final answer:
The three main categories of modern psychodynamic theorists are psychoanalytic, object relations, and self-psychology, evolving from Freud's foundational psychoanalytic theory.
Step-by-step explanation:
The three main categories of modern psychodynamic theorists are psychoanalytic, object relations, and self-psychology. These categories evolved from the foundational work of Sigmund Freud, who developed psychoanalytic theory. Modern psychodynamic theorists have expanded upon Freud's original concepts, with object relations focusing on the impact of early relationships and self-psychology centered on the development of a cohesive self-identity.