Azoulay on Star Scientists

By Peter Klein

Pierre Azoulay has written a number of important and interesting papers on the economics and sociology of science: How does teamwork effect science? What are the relationships among scientists and students, collaborators, and rivals? A new paper with Christian Fons-Rosen, Joshua S. Graff Zivin looks at the unexpected death of a “star” scientist to identify the (exogenous) impact of the star’s research on her field. The main result — that stars matter — is perhaps not surprising, but the magnitude of the effect is remarkable.

Consistent with previous research, the flow of articles by collaborators into affected fields decreases precipitously after the death of a star scientist (relative to control fields). In contrast, we find that the flow of articles by non-collaborators increases by 8% on average. These additional contributions are disproportionately likely to be highly cited. They are also more likely to be authored by scientists who were not previously active in the deceased superstar’s field. Overall, these results suggest that outsiders are reluctant to challenge leadership within a field when the star is alive and that a number of barriers may constrain entry even after she is gone.

Read the whole thing, as well as related work by Toby StuartJoshua Graff Zivin, and others.

Update: Here is a non-technical summary on

[Cross posted at Organizations and Markets]