We are broadly interested in the evolution of biological diversity and the predictability of evolution. We investigate a wide array of topics in evolutionary ecology, seeking a better understanding of the forces generating phenotypic differentiation and speciation.

  We employ comparative analyses of multiple populations and multiple species across multiple environments, in combination with experiments examining the links between phenotype, performance, and fitness. Much of our work focuses on the role of predators and other selective agents in the evolutionary diversification of small livebearing fishes in the genus Gambusia (native to USA, Central America, and Caribbean).