Robert M. Gordon Ph.D. ABPP is a Diplomate of Clinical Psychology and a Diplomate of Psychoanalysis in Psychology, as well as Fellow of the Division of Psychoanalysis, and served on the governing council of the American Psychological Association. He was president of the Pennsylvania Psychological Association and received its Distinguished Service Award. He authored many scholarly articles and books in the areas of psychotherapy, relationships, forensic psychology, ethics and the MMPI-2. He has a private practice in Allentown, PA.
Since no single theory can explain it, I have developed a unified model combining all of the main contributing factors in love relations from evolutionary psychology, personality trait theory, object relations and attachment, cognitive
psychology and social psychology. I use a heuristic pyramid to illustrate these five factors. Starting at the base, these factors are: species traits, individual traits, relational internalizations, beliefs and current context. Each factor puts a dynamic influence on the others. The five factors are conceptually linked through time, moving from evolutionary history through to the present context.