Mark is an ecologist researching environmental change in freshwaters. His research group is focused on understanding how environmental stressors and climate change, especially extreme climatic events such as floods, droughts and heat waves, affect the structure and functioning of aquatic ecosystems. His group works empirically across a range of spatial and temporal scales, from laboratory microcosms to natural environmental gradients in real ecosystems, and has developed new state-of-the-art mesocosm facilities which enable novel interdisciplinary experimental approaches to be applied in areas of water science usually characterised by phenomenological study. Mark currently leads several NERC-funded research projects and supports a number of doctoral researchers and postdoctoral fellows. He also works actively with a growing network of colleagues in the UK and overseas.