Ramzi Touchan is a Research Professor in the Laboratory of Tree-Research and a Joint Professor in the School of Natural Resources and Environment at the University of Arizona, Tucson, USA. His field of expertise is developing long tree-ring chronologies to reconstruct past climate in different parts of the world. Current research programs include establishing a multi-century network of climate records for the USA, Russia, eastern Mediterranean, and North Africa based on tree rings by extending and enhancing existing tree-ring datasets, and by developing new tree-ring chronologies geographically and temporally. This network is being and will be used to study inter-annual to century-scale climate fluctuations in the region and their links to large-scale patterns of climate variability.
David M. Meko is a Research Professor in the Laboratory of Tree-ring Research at the University of Arizona, Tucson, USA. He uses tree-ring data and instrumental data to study the natural variability of climatic and hydrologic systems and he has participated in several studies applying tree-ring data to extend records of streamflow for water resources agencies in the western United States. A current research topic is the investigation of snowpack signal in tree-ring data from the Sierra Nevada in California.