David J. GriffithsDavid J. Griffiths is Emeritus Professor of Physics at Reed College, Oregon, where he has taught for over 30 years. He received his BA and Ph.D. from Harvard University, where he studied elementary particle theory. He has published three widely-used extbooks on the topics of quantum mechanics, electrodynamics, and particle physics, and a lower-level text titled Revolutions in Twentieth-Century Physics (Cambridge, 2012). Read More Read Less