Countries and Institutions with most top Physics personnel

 The productivity and 'success' of scientists can be measured several ways, and perhaps the most popular is looking at the number of publications and citations a scientist has. This makes sense because to be  published in peer reviewed journals shows the work is considered strong, and people cite it when they find it useful, valuable, and well done. Citations mean the work is affecting the field. There is a measure called the D-index based on these criteria.

So you can find the countries and institutions with the most physics personnel with high D-index values. By far, the United States leads for countries, followed by Great Britain. For institutions, Caltech leads the way, and the only non-US institutions in the top ten are the Max Planck Institute and University of Cambridge.