David Marr was a prominent British neuroscientist and psychologist, known for his influential work in the fields of vision and cognitive science. He was born on July 19, 1945, and passed away on November 17, 1980. Marr is best known for his theory of vision, which proposed that visual processing occurs in three stages: the primal sketch, the 2.5D sketch, and the 3D model. His ideas have significantly shaped our understanding of how the brain interprets visual information. Marr's contributions extended beyond vision; he also explored topics related to artificial intelligence and the computational theory of mind. His book, Vision, published in 1982, remains a foundational text in the study of visual perception. Marr's interdisciplinary approach combined insights from neuroscience, psychology, and computer science, making him a key figure in the development of modern cognitive science.