Aaron Wirsing is an ecologist who studies the ways that large carnivores can change the lives of their prey beyond simply killing and eating them. Using a combination of fieldwork and modeling techniques, and working in both terrestrial and aquatic systems, he looks at the ways that top predators, such as grey wolves and tiger sharks, can shape their communities and ecosystems through their presence alone. His suite of projects shows the benefits of what he calls an “ecology without borders” approach. By comparing the mechanisms that drive predator effects in both aquatic and terrestrial environments, he aims to show underlying similarities between two seemingly disparate systems.