David Walsh is a Professor in the Department of Biology at Concordia University, specializing in the microbial ecology and genomics of aquatic ecosystems. His research explores how climate change and anthropogenic activities affect microbial communities in northern oceans, estuaries, and seasonally ice-covered lakes. Education: PhD, Dalhousie University Research Interests: Microbial ecology of aquatic systems, climate change impacts on oceanic and freshwater microbiomes, environmental genomics, and evolutionary adaptations of microorganisms. His work combines metagenomic and metaproteomic approaches to study biodiversity, metabolic traits, and ecosystem-level responses to environmental stressors. Publication Trends: Recent studies focus on Arctic Ocean microbial transitions, mercury cycling in boreal rivers, and continental-scale lake microbiome patterns. Keywords include environmental genomics, climate change, and aquatic biogeochemistry.