Smithsonian Marine Station, National Museum of Natural History, Smithsonian Institution

Emeritus Professor, University of Sydney

Australian Rivers Institute, Griffith University

The Hebrew University

Korea Research Institute of Bioscience & Biotechnology

Norwegian Institute for Water Research (NIVA)

Australian National Univeristy

Professor of Microbiology, University of Potsdam

Bundeswehr Institute of Microbiology

Professor of Plant Ecology and Systematics