Professor of Plant Ecology and Dedrochronology

Regents Professor Emeritus of Dendrochronology, Lab. of Tree-Ring Research, Univ. AZ

Regents' Professor of Dendrochronology, University of Arizona

IANIGLA

Department of Geography, University of Mainz

Director and Professor; Laboratory of Tree-Ring Research, Univ Arizona

Institute of Plant and Animal Ecology, Ural Branch of the Russian Academy of Sciences

Research Professor, University of Arizona

Retired Professor of Geography, The University of Tennessee, Knoxville

Professor, School of Geography and Development, University of Arizona