Lee S. Shulman (born September 28, 1938) is an American educational psychologist. He has made notable contributions to the study of teaching, assessment of teaching, and the fields of medicine, science, and mathematics.
Shulman is a professor emeritus at Stanford Graduate School of Education, past president of the Carnegie Foundation for the Advancement of Teaching, past president of the American Educational Research Association, and the recipient of several awards recognizing his educational research. From 1963 to 1982, Shulman was a faculty member at Michigan State University, where he founded and co-directed the Institute for Research on Teaching (IRT).
Shulman is credited with popularizing the phrase "pedagogical content knowledge" (PCK). He was the 2006 recipient of the University of Louisville Grawemeyer Award in Education for his 2004 book, The Wisdom of Practice: Essays on Teaching, Learning and Learning to Teach. 
Pedagogical content knowledge (PCK)
Shulman (1986) claimed that the emphases on teachers' subject matter knowledge and pedagogy were being treated as mutually exclusive. He believed that teacher education programs should combine the two knowledge fields. To address this dichotomy, he introduced the notion of pedagogical content knowledge that includes pedagogical knowledge and content knowledge, among other categories. His initial description of teacher knowledge included curriculum knowledge, and knowledge of educational contexts.
Shulman also claimed that Sesame Street was the very best resource for teachers for expanding their pedagogical content knowledge.
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- Shulman, L. S. (1986). Those who understand: Knowledge growth in teaching. Educational Researcher, 15(2), 4-31.
- Palmer, Joy A.; Bresler, Liora; Cooper, David E., eds. (2003). Fifty modern thinkers on education: from Piaget to the present (Repr. ed.). London: Routledge. ISBN 978-0415224093.