Lewis P. Lipsitt and Dorothy H. Eichorn
Nancy Bayley has been a giant among developmental psychologists, steadfastly enhancing our understanding of human development throughout the life course. The Bayley Scales of Mental and Motor Development, widely recognized as the best standardized measures of infant development, are used internationally. One of the first to discuss life-span development as a frame of reference for research, Bayley has documented change as well as continuity in intellectual, cognitive, and psychomotor development, and the effects of maternal behavior on offspring, using both naturalistic and experimental methodologies. She has been a pioneer in the rigorous measurement of intelligence in infants and young children, in the study of rate of physical maturation and its behavioral correlates, and in setting a model of multidisciplinary cooperation for the advancement of knowledge about human development. In recognition of her achievements, she received the G. Stanley Hall Award from the Division of Developmental Psychology of the American Psychological Association (APA), APA's Distinguished Scientific Contributions Award, and the Gold Medal Award of the American Psychological Foundation. Bayley was elected a Fellow of both the American Psychological Association and the American Association for the Advancement of Science.
Nancy Bayley was born in The Dalles, Oregon, on September 28, 1899, the daughter of Prudence Cooper Bayley and Frederick W. Bayley. Her father headed the grocery department of a large department store in that city. Her mother cared not only for her own family, which included Bayley's two older siblings, Dorothy and Prudence, and two younger ones, Alfred and Katharine, but also assisted many families in the community both when they were in need and when the occasion was festive.
Attesting to the pioneering spirit of the family from which she came, Bayley's paternal grandparents sailed around Cape Horn to Victoria, British Columbia. Her grandfather was a member of the colonial government there, and her grand-
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