David Dudgeon has spent almost 40 years at HKU researching and writing about the streams and rivers of monsoonal East Asia, and the animals that live in and around them. His work ranges over a variety of topics from the ecology of aquatic macroinvertebrates and small fishes, through manipulative field experiments that examine predation, competition and grazing in streams, to studies of food webs, and broader-scale global analyses concerning the conservation of freshwater biodiversity. He received the Biwako Prize in Ecology in 2000. Dudgeon has supervised 20 M.Phil. and 22 PhD students. His books include Tropical Asian Streams (1999), The Ecology and Biodiversity of Hong Kong (2005 and 2011), and an edited collection, Tropical Stream Ecology (2008). A new volume - Freshwater Biodiversity: Status, Threats and Conservation - will be published by Cambridge University Press in 2020.