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I now study urban environmental issues. In 2011 I published "Constructed Climates: A primer on urban environments" concerning urban ecology and ecosystem services in cities, linking urban heat islands, air and water quality, asthma and other health problems, global warming, energy and carbon footprints, and social equity issues. That book is freely available as a website at www.constructedclimates.org, and some additional information on my website here. I've terminated my past research program on theoretical evolutionary ecology. Looking back, studying theoretical ecology had great personal value through my own fascination, but continuing a high quality research program in that area ran up against the lack of value of ecology (and theoretical evolutionary ecology) to national, university, departmental, and disciplinary priorities.

New Academic Focus: Looking forward, there are many environmental problems that deserve commitments. Since the mid-2000s, my service on the Durham City/County Open Space and Trails Commission (follow the links on my main page) posed interesting questions concerning urban ecology. These questions have value to society, making it an inherently valuable academic commitment. I'm following those interests, and I've placed here information and links to literature from an "ecosystem services" seminar I led.

Here's some more details of my research life after my Ph.D.:
Starting in 1988 I spent five enjoyable years at the University of Calgary in Alberta, Canada. There I developed research interests with various collaborators: 1) fluid flow through porous media problems with Bill Laidlaw; 2) seismic image enhancement with Kris Vasudevan; 3) spatial predator-prey theory with Ed McCauley and Andre de Roos; and 4) floral evolution with Lawrence Harder.

I then went to the University of California at Santa Barbara to work with Roger Nisbet. Interactions with Roger, Russ Schmitt, and Craig Osenberg, laid the foundation of my present work on resouce-consumer models.

I then gained a faculty position in the Department of Zoology (now Biology) at Duke University in 1996 with a position offered through the Center for Nonlinear and Complex Systems.

My past interests spanned theoretical evolutionary ecology, and my approaches include both mathematics and individual-based simulation models. Along these lines I've examined a variety of single- and multiple-species systems to understand how spatial extensions affect population-level dynamics. An ongoing interest is the connection of theoretical and empirical systems.

Most of my primary publications are available from this website.