- 2003-present: Professor and Restoration Ecologist, University of California, Davis
- 1996-2003: Lecturer, Assistant and Associate Professor, University of California, Davis
- 1992-96: Associate Professor, Fordham University
- 1981-91: Post-doc, Lecturer, Consultant, Tour Guide, Scientific Director, peripatetic tropical ecologist
- 1976-81: University of Pennsylvania (Ph.D.)
- 1972-75: University of Chicago (B.A.)
I have broad interests in plant population and community ecology, including more than 40 years of research in Africa. For the last 25 years, I have been involved with more applied research at the community and landscape scales in California and Kenya. My current research projects are related to the ecology, management, restoration, and conservation of human-dominated landscapes.
My current research focuses on the following primary projects:
- Wildlife, livestock and biodiversity in an African savanna: the Kenya Long-term Exclosure Experiment (KLEE)
- Contingency in restoration ecology: priority effects, year effects, and site effects (PRYER)
Secondary (and past) research includes:
- Critical issues in ecological restoration
- The maintenance of biodiversity in a model system (ACACIA)
- The evolutionary ecology of semelparity ("big bang" reproduction)
I also have collaborated with Lynne Isbell in her studies of primate behavioral ecology. I provide a life history and plant ecological perspective to her explorations of how food and predation influence the evolution of mammalian behavior. (Behavioral ecology publications).
Satellite view of the KLEE exclosure plots in Laikipia, Kenya, where we have been excluding various combinations of cattle, wildlife, and mega-herbivores (elephants and giraffes) from a savanna grassland since 1995. Each of the 18 plots is 200m x 200m. This is an image taken 2015 (Google Earth). Darker areas are indicative of greater densities or forbs and woody species. The larger white areas are anthropogenic glades, and the smaller (30m x 30m) white squares visible in some plots are the 2013 controlled burns.