Susan Graham, Phd, is Canada Research Chair in Language and Cognitive Development and an Associate Professor in the Department of Psychology at the University of Calgary. Her research focuses on language and cognitive development during the infancy and preschool years. Specifically, on how language guides infants' and preschoolers' acquisition of and reasoning about object categories. Another aspect of her research examines preschoolers' communicative perspective-taking. Susan has published extensively in each of these areas.