Levin's current interests are in the parallels between ecological systems and financial and economic systems, particularly with regard to what makes them collapse and to the evolution and development of structure and organization, and in the management of public goods and common-pool resources. His ecological research is concerned with the evolution of diversification, the mechanisms sustaining biological diversity in natural systems, the implications for ecosystem structure and functioning, and the dynamics of infectious diseases. He has also been involved in issues of sustainable development with emphasis on the linkages between environmental and socioeconomic systems. Ph.D. University of Maryland.