Senior Scientist Emeritus, Patuxent Wildlife Research Center, USGS

Professor of Ecology, ACA Chair in Fisheries & Wildlife, University of Alberta

Head of Wildlife Service ISPRA, and Chair IUCN Invasive Species Specialist Group

University of Montana

Professor of Conservation Biology and Restoration Ecology - University of Bern

Professor emeritus, Animal Ecology

UNIVERSITY OF OTAGO

Visiting Prof Univ Greenwich, UK; Adjunct Prof Nth Arizona Univ

Gordon Gullion Chair Emeritus, University of Minnesota

Professor, Dep. Biology, Faculty Sciences & CIBIO, University of Porto