Graham Wallas

Graham Wallas (1858-1932) was a British social psychologist and political theorist, renowned for his contributions to the understanding of the creative process. His influential book, 'The Art of Thought' published in 1926, proposed a four-stage model of creativity that includes preparation, incubation, illumination, and verification. Wallas's work has had a significant impact on psychology and the study of creativity, emphasizing the importance of unconscious thought and the incubation period in generating innovative ideas and solutions.