Nature includes a brief piece on a tool that ranks scientists according to the quality of their work and predicts future performance. The Hirsch Index (h-index) reflects the number n of a researcher’s papers that have all received at least n citations, impact factor be damned. For example, George Whitesides (Harvard) has 135 papers that have been cited at least 135 times. Hirsch has found that the h-index predicts future productivity even better than it does past productivity.
Hirsch Index of Scientific Achievement