Tomkins' magnum opus, Affect Imagery Consciousness, was published by Springer Publishing Company in four volumes over 30 years. When Tomkins began writing the book in the 1950's, American psychology was dominated by psychoanalytic and behaviorist theories - neither of which placed much importance on the role of basic emotions in everyday human behavior. Tomkins challenged the status quo by developing - over the span of nearly 2,000 pages -- a theory of consciousness and motivation that placed emotion at the core of the human experience.