Eleanor Rosch (once known as Eleanor Rosch Heider; born 1938) is an American psychologist. She is a professor of psychology at the University of California, Berkeley, specializing in cognitive psychology and primarily known for her work on categorization, in particular her prototype theory, which has profoundly influenced the field of cognitive psychology. Throughout her work Rosch has conducted extensive research focusing on a range of topics, including semantic categorization, mental representation of concepts, and linguistics. Her research interests include cognition, concepts, causality, thinking, memory, and cross-cultural, and Eastern and religious psychology. Her more recent work in the psychology of religion has sought to show the implications of Buddhism and contemplative aspects of Western religions for modern psychology. Early life and education Rosch was born in New York City, the daughter of an English teacher from England and a mother who was a Russian refugee. She completed an undergraduate philosophy thesis at Reed College on Wittgenstein, who she said "cured her of studying philosophy." After school, she served as a social worker in Portland for several years, returning later to Harvard to study clinical psychology at the then-Department of Social Relations. Rosch delivered a paradigm-changing doctoral thesis at Harvard about category formation, under the direction of Roger Brown. After a short stint at Brown University and Connecticut College, Rosch joined the Department of Psychology at University of California, Berkeley in 1971. Research From field experiments Rosch conducted (alongside her then-husband Karl Heider) in the 1970s with the Dani people of Papua New Guinea, she concluded that when categorizing an everyday object or experience, people rely less on abstract definitions of categories than on a comparison of the given object or experience with what they deem to be the object or experience best representing a category ("prototype"). Although the Dani lack words for all the English colors (their language contained only two color terms dividing all colors into either the "light, bright" category or the "dark, cool" category), Rosch showed that they could still categorize objects by colors for which they had no words. She argued that basic objects have a psychological import that transcends cultural differences and shapes how such objects are mentally represented. She concluded that people in different cultures tend to categorize objects by using prototypes, although the prototypes of particular categories may vary. Rosch contributed to multiple scholarly works of taxonomic analysis of objects based on these prototype