I am an evolutionary ecologist who uses genomic tools to understand processes of diversification, population structure, and adaptation to conserve populations in light of human exploitation and habitat alteration. My projects integrate population and ecological genomics with population and community ecology, physiology, biogeography, and phylogenetics. Much of my research has used South American freshwater fishes, the largest assemblage of vertebrate species on Earth, as a study system, but I also have recent projects using tropical and temperate marine fishes and invertebrates. My current research focuses on exploited anadromous fishes in the Columbia River basin.