**About the Editors**

**Roberto Tognetti** (Ph.D.): Plants live in a wide range of environments and the conditions in these environments can fluctuate dramatically over the time scales of seconds to years and beyond. I use the combined potential of biometeorology and ecology to study the effects of disturbances on tree productivity and plant development. I focus on the basic environmental physiology of carbon, water, and nutrient cycling and strive to integrate these physiological processes to gain an understanding of plant functions and ecosystem processes, in a changing global environmental setting. Roberto Tognetti received an M.Sc. in forest science from the University of Firenze and a Ph.D. in plant physiological ecology from Trinity College Dublin. He is Full Professor of forest ecophysiology and silviculture at the Department of Agricultural, Environmental and Food Sciences, University of Molise.

**John D. Marshall** (Ph.D.): Trees and forests are like icebergs, where the part you can see is far less than the sum of everything that's going on. And as with an iceberg, the part you can't see can be important. I work with measurements of processes that are largely invisible, like photosynthesis and transpiration, but can be measured and can tell us important things about how a forest will respond to something like fertilization or climate change. The tools we use to measure these invisible processes and help us to build budgets for carbon and water, which allow us to explain and predict forest responses to change. John D. Marshall received an M.Sc. in forestry from Michigan State University and a Ph.D. in forest science from Oregon State University. He is Guest Professor and Senior Adviser at the Department of Forest Ecology and Management, Ecophysiology Unit, Swedish University of Agricultural Sciences.
