My primary interests lie in population and evolutionary ecology, and in molecular systematics, phylogeography (the study of the geographical distribution of genealogical lineages, especially those of intraspecific populations), and biogeography of reptiles and amphibians. My ongoing research projects include:

• Comparative phylogeography of the White-lipped Frog (Leptodactylus albilabris), the Green Anole (Anolis evermanni), the Yellow-chinned Anole (Anolis gundlachi), and the Puerto Rican Racer (Alsophis portoricensis) (with Mallory E. Eckstut)
• Feeding ecology of the Coachwhip, Masticophis flagellum (with Xavier Glaudas)
• Landscape genetics of Anolis pulchellus (with Tereza Jezkova and Manuel Leal)
• Historical biogeography and landscape genetics of the "Coquí Churí," Eleutherodactylus antillensis (with Brittany S. Barker)
• Why viper snakes do not eat eggs? (with Alan de Queiroz)
• Origin of rattlesnakes (Crotalus and Sistrurus): molecular phylogenetic tests of alternative hypotheses (with Kelly R. Zamudio, Harry W. Greene, David M. Hillis, and Jonathan A. Campbell) (See Evolution and biogeography of rattlesnakes)

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