Professor of Silviculture and Forest Ecology of the temperate zones

Institute of Biodiversity and Ecosystem Research

Professor Emeritus of Quantitative Silviculture, University of Missouri

USDA Forest Service, Rocky Mountain Research Station

Research Fellow, School of Forestry & Wildlife Sciences, Auburn University

Michigan Technological University

University of Arkansas-Monticello

University of Ljubljana, Biotechnica Faculty, Dept. of Forestry and Renewable Forest …

Professor of Biology, Bemidji State University

Department of Forest Resources, University of Minnesota