World Agroforestry (CIFOR-ICRAF; cgiar), Bogor; Brawijaya University, Malang, Indonesia; …

Professsor of Plant Ecology, Radboud University Nijmegen, the Netherlands

University Minnesota USDA ARS, Agronomy and Plant Genetics, University of Minnesota

University of Nebraska Lincoln

Professor Plant Ecology and Nature Conservation, Wageningen University

Mendel University in Brno

Emeritus Professor, University of Aberdeen

Cientifico Titular del CSIC

Distinguished Scientist, Group Leader, Oak Ridge National Laboratory

The Morton Arboretum