sentences:  He has also authored two textbooks, the first being "Magnetism in Condensed Matter" , which covers the quantum mechanical nature of magnetism.Most recently he has co-authored, with his wife and colleague, astrophysicist Katherine Blundell of St John's College, Oxford, a textbook entitled "Concepts in Thermal Physics".It provides an introduction to the topics of thermal physics and statistical mechanics covered in a typical undergraduate course in physics.