Dr. Richard Paul was a leading proponent of critical thinking and through his work and legacy remains an international authority in the field. He founded the Center for Critical Thinking at Sonoma State University in 1980, followed by the Foundation for Critical Thinking. He developed concepts, principles, and theory essentials to a robust and fairminded conception of critical thinking and authored more than 200 articles and seven books on the topic. He presented workshops to hundreds of thousands of educators over his 35-year career as a leader in the critical thinking movement.