 At Cornell University 1965-1992, he was Chair of the Section of Ecology and Systematics, and then Director of the Ecosystems Research Center, the Center for Environmental Research and the Program on Theoretical and Computational Biology, as well as Charles A. Alexander Professor of Biological Sciences (1985-1992).In 1992, Professor Levin published his highly cited paper, titled "The Problem of Pattern and Scale in Ecology".Since 1992, he has been at Princeton University where he is currently George M. Moffett Professor of Biology and Director of the Center for BioComplexity.