In the late 1970s I worked with Larry Tieszen (Augustana College)
in Alaskan arctic tundra, examining the comparative ecophysiology
of plant lifeform response to defoliation. In the early 1980s
I worked with Jim Detling at the Natural
Resource Ecology Lab (Colorado State), quantifying the effects
of prairie dog and bison herbivory on mixed-grass prairie ecosytems.
I joined the faculty of Rangeland
Ecology and Management at Texas A&M in 1983 and began
work on grass-woody plant interactions in the southern Great Plains,
which continues through to the present. I joined the faculty at
the University of Arizona in 2002 and am currently exploring how
changes in land cover (natural and human-induced) affect ecosystem
processes.