Aaron Wirsing is an ecologist who studies predator-prey interactions and, in particular, the ways that large carnivores can change the lives of their prey beyond simply killing and eating them. Working in both terrestrial and aquatic systems, he explores ways that top predators, such as grey wolves and tiger sharks, can shape their communities and ecosystems both as agents of mortality and through their presence alone, as well as how humans can mediate predator-prey interactions through processes such as urbanization and climate change. His suite of projects shows the benefits of what he calls an “ecology without borders” approach, whereby comparison of findings from terrestrial and aquatic environments can yield general insights into how the natural world works.