1. Graduate research assistant in the Department of Geography, University of Illinois, Urbana 61801.
2. Associate professor in the Coastal Ecology Laboratory, Center for Wetland Resources, Louisiana State University, Baton Rouge 70803.
3. Assistant professor in the Section of Ecology and Systematics, Cornell University, Ithaca, New York 14853.
4. Research scientist in the Complex Systems Research Center, University of New Hampshire, Durham 03824.