In The Oxford Encyclopedia of Psychology and Aging, Bob Knight and an editorial team comprised of Nicole Anderson, Shevaun Neupert, Nancy Pachana, and Hans Werner-Wahl, have created a comprehensive collection of peer-reviewed articles authored by the top researchers in the field. This work, which is availabe both in print and digitally, serves as a reference to provide a broad overview of the field of psychology and aging, and as a springboard for delving more deeply into specific topics. The first section covers theories and conceptual models that shape the field, including perspectives from neighboring disciplines like biology and sociology of aging. The second covers methodologies and analytic approaches to the study of aging. Section three explores the cognitive and affective neuroscience of aging. Section four covers a wide range of social and environmental influences on aging and on older adults. Section five covers clinical geropsychology, developmental psychopathology and the implications of aging, and finally the late life context for psychological assessment and therapy with older adults.