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

Emeritus Professor, University of Sydney

Australian Rivers Institute, Griffith University

Station Biologique de Roscoff, UMR 7144 CNRS & Sorbonne Université, Roscoff, France

Banararas Hindu University

Wageningen University

Korea Research Institute of Bioscience & Biotechnology

Norwegian Institute for Water Research (NIVA)

The Hebrew University

Professor of Plant Ecology and Systematics