Molecular phylogenetics and comparative genomics. Projects in my lab include phylogenetic analyses of major groups of actinopterygian fishes with particular interest in the Cyprinidae and other ostariophysans; comparative analysis of nuclear and mitochondrial genomes or genomic regions; evaluation of nucleotide sampling in phylogenetic analysis (i.e., how many nucleotides are required to resolve phylogenies relative to divergence among taxa, taxon sampling, and tree shape); and investigation of historical signal in molecular data sets (when is homoplasy bad, when is homoplasy good, and how can we tell the difference?).