I am a historian of modern physics whose interests include the history of quantum mechanics and nuclear physics in their institutional and cultural settings and the role of the history of physics in physics teaching. I received my Ph.D. from the University of Wisconsin in 1968 and became Professor Emeritus at the University of Minnesota in 2000. I also taught at Boston University, held a research appointment at Harvard University, and was a visiting professor at the Universities of Munich, Vienna, Graz, and Amsterdam. I was cofounder and coeditor of the journal Physics in Perspective, am editor of the Resource Letters of the American Journal of Physics, and serve on the editorial boards of other leading journals. I am a member of the Program Committee of the Vienna International Summer University. I have served as secretary of the History of Science Society, chair of the Forum on the History of Physics (FHP) of the American Physical Society (APS), FHP Councilor of the APS, chair of the American Institute of Physics (AIP) Advisory committee on History of Physics, and chair of the Section on History and Philosophy of Science of the American Association for the Advancement of Science (AAAS). I have been a Sigma Xi Distinguished Lecturer and an APS Centennial Speaker. I received Distinguished Service Citations from the Institute of Technology of the University of Minnesota and the American Association of Physics Teachers (AAPT). I have been elected as a Fellow of the AAAS, the APS, and the AAPT. I was awarded the 2013 APS-AIP Abraham Pais Prize for History of Physics and the 2014 Distinguished Alumni Award of the Department of Physics of the University of Wisconsin-Madison.
The Compton Effect: Turning Point in Physics (New York: Science History Publications, 1975).
Nuclear Physics in Retrospect (Minneapolis: University of Minnesota Press, 1979).
"Artificial Disintegration and the Cambridge-Vienna Controversy." Pp. 239-307 in Observation, Experiment, and Hypothesis in Modern Physical Science, eds. Peter Achinstein and Owen Hannaway (Cambridge: MIT Press, 1985).
"The Origin of the Liquid-Drop Model and the Interpretation of Nuclear Fission." Perspectives on Science 2 (1994): 39-92.
"Historical Surprises." Science and Education 15 (2006): 521-530.
"The Seventh Solvay Conference: Nuclear Physics, Intellectual Migration, and Institutional Influence" (forthcoming).