Richard Shiffrin is a prominent American psychologist known for his significant contributions to the field of cognitive psychology. He is best recognized for his work on memory, particularly the development of the Atkinson-Shiffrin model, which describes how information is processed and stored in the human mind. This model has been influential in understanding the stages of memory: sensory memory, short-term memory, and long-term memory. Shiffrin has also conducted extensive research on attention and information processing. His studies have helped clarify how people focus on specific stimuli while ignoring others, which is crucial for understanding human cognition. Throughout his career, he has published numerous articles and books, shaping the way psychologists study and interpret cognitive functions.