We report a puzzling pair of facts concerning the organization of science. The concentration of research output is declining at the department level but increasing at the individual level. For example, in evolutionary biology, over the period 1980 to 2000, the fraction of citation-weighted...

This study examines the determinants of exit from academic research which occurs when academic researchers move into positions in academe which concentrate on non-research activities such as teaching or administration, or when researchers leave academia and move into industry. Drawing on career...