George A. Miller was a prominent American psychologist known for his groundbreaking work in cognitive psychology. He is best recognized for his research on memory and the concept of 'the magical number seven, plus or minus two,' which describes the limits of human capacity for processing information. Miller's contributions extended beyond memory; he was a pioneer in the study of language and communication. He co-founded the Center for Cognitive Science at Harvard University and played a significant role in advancing the field of psychology through his innovative ideas and research methodologies.