h-index

Index aims for fair ranking of scientists
The h-index, proposed by Jorge Hirsch, is a novel invention for measurment of research achievement. Professor Jorge Hirsch is a physicist at the University of California, San Diego, USA. h-index is the highest number of papers a scientist has that have each received at least that number of citations. Thus, someone with an h-index of 50 has written 50 papers that have each had at least 50 citations. Here are some examples of the highest-ranked physicists, by h-index:
110 Ed Witten: Princeton Institute for Advanced Study. Devised M theory.
94 Marvin Cohen: University of California, Berkeley. Condensed-matter theorist.
91 Philip Anderson: Princeton University. Condensed-matter theorist, won Nobel prize in 1977.
86 Manuel Cardona: Max Planck Institute for Solid State Research. Works on superconductors.
79 Pierre-Gilles de Gennes: ESPCI, Paris. Condensed-matter theorist, won Nobel prize in 1991.
68 Frank Wilczek: Massachusetts Institute of Technology. Won Nobel prize in 2004 for work on the strong force.
66 David Gross: Kavli Institute for Theoretical Physics, Santa Barbara. Won 2004 Nobel prize with Wilczek.
http://www.nature.com/nature/journal/v436/n7053/pdf/436900a.pdf