E. D. Hirsch Jr. began his career as a literary theorist. As a result of this work, he became aware of the importance of background knowledge for reading comprehension. However, when he looked to the education system, he found knowledge was undervalued. Since then, he has worked to highlight the importance of knowledge though his numerous books, including the best-selling Cultural Literacy, and the Core Knowledge Foundation that he set-up to further these aims by developing the Core Knowledge Sequence, now used in many schools in the US and beyond. In this episode, Don talks to Greg Ashman about knowledge, education, the importance of a 'speech community' and commonality more generally, as well as his new book, How to Educate a Citizen.