David Marr was a prominent cognitive scientist and neuroscientist known for his influential work in understanding vision and perception. He proposed a framework for studying visual processing that included three levels: the computational level, the algorithmic level, and the implementational level. This approach helped clarify how the brain interprets visual information. Marr's groundbreaking book, Vision, published in 1982, laid the foundation for modern research in computer vision and neuroscience. His ideas emphasized the importance of both biological and computational perspectives in understanding how we perceive the world around us. Marr's contributions continue to inspire researchers in various fields.