John A. Raven (1941–2024) was Emeritus Professor at the Division of Plant Science, University of Dundee, UK. He was also Adjunct Professor at the School of Biology, University of Western Australia, and Visiting Professor at the University of Technology, Sydney. His research focussed on the functioning of photosynthetic organisms, particularly aquatic photosynthetic organisms, in relation to their environment. He published over 500 peer-reviewed papers and book chapters and was elected Fellow of the Royal Society of Edinburgh (1981) and Fellow of the Royal Society, London (1990).