- Professor, Department of Biology, McGill University (2004-present)
- Honorary Lecturer, Makerere University, Kampala, Uganda (1990-present)
- Associate Member, McGill School for Environment (2006-present)
- Associate Member, Redpath Museum, McGill University (2009-present)
Aquatic ecology and conservation, evolutionary and ecological consequences of respiratory strategies in fishes, ecophysiology, ecomorphology, adaptive divergence, tropical inland waters, Africa. Recent work focuses on divergent selection across oxygen gradients in fishes, the interaction of hypoxia with other environmental stressors (e.g., introduced species, climate warming), and the value of tropical wetlands in the maintenance of fish faunal structure and diversity.