Dr. Linda Elder is an educational psychologist and internationally recognized authority on critical thinking who has taught both psychology and critical thinking at the college level. She has been President of The Foundation for Critical Thinking and Executive Director of The Center for Critical Thinking since 1994. She has a special interest in the relation of thought and emotion, as well as the twin barriers to critical thinking of egocentric and sociocentric thinking. Dr. Elder has developed an original theory of the stages of critical thinking development, and she has authored and coauthored many books, thinker's guides, and articles on critical thinking. She is sole author of Liberating the Mind: Overcoming Sociocentric Thought and Egocentric Tendencies.