My research interests center on global plant physiology, on quantifying and understanding the spatial and temporal patterns of plant function that drives ecosystem metabolism, the adaptations and responses to environmental conditions related to weather, soils, and biodiversity, and the role of plant-atmosphere interactions in the global cycles of carbon, water and energy. I focus on satellite remote sensing of photosynthesis and transpiration and methods of scaling from leaf to globe. This involves an interdisciplinary approach that combines physiology, meteorology, remote sensing, and modeling.
Interrelationships among plant, soil and atmospheric processes that determine whole ecosystem metabolism of carbon, water, energy and nutrients [from Mooney et al. 1999].
After many years in academia, I am currently a research scientist with DuPont Pioneer in Johnston, Iowa where I apply imaging and remote sensing technologies to plant phenotyping. In addition to my work with Pioneer, I continue research as an independent scientist through Theiss Research to pursue the development of remote sensing methods for quantifying biosphere-atmosphere interactions and global plant physiology. I am currently working on a NASA funded project with colleagues at JPL to produce high spatial and temporal resolution estimates of global evapotranspiration using satellite observations.