I am interested in understanding the processes that generate and maintain biodiversity, both to answer basic questions in biology and to design effective conservation strategies. I approach this problematic using molecular tools to study the evolution of avian systems, generally in the early stages of speciation. I also use field ornithology methods and the comparative analysis of vocalizations and coloration. I have experience in a wide variety of genetic methods that allow the study of organisms with different degrees of divergence and sampled using different designs (e.g., individuals versus loci). These methods include phylogenetics, phylogeography, population genetics, landscape genetics, and genomics. A significant part of my work has focused on understanding species limits and patterns of introgression in an explosive radiation of South American finches in the genus Sporophila.