Justin C. Bagley, Ph.D., is Assistant Professor of Biology in the Department of Biology at Jacksonville State University, and Affiliate Researcher in the Department of Biology at Virginia Commonwealth University; Instructor for Introductory Biology I, graduate Seminar in Systematics, and Ichthyology; researcher in ecological and evolutionary genetics of animals and plants in North America and the Neotropics; developer of PIrANHA, RADish, and other repositories for analyzing population genomic and phylogenomic datasets.

After receiving his BS (2004) and MSc (2008) degrees in Biology from The University of Alabama, Justin received his PhD in Integrative Biology (2014) from Brigham Young University for his work on comparative phylogeography and species delimitation in Central American freshwater fishes under Jerry Johnson. He was a Young Talent Fellow postdoc in Brazil's CNPq Science Without Borders program under Francisco Langeani and Guarino Colli at the Universidade de Brasília (2015–2017), and he completed a postdoc (2017-2018) in Andrew Eckert's Plant Evolutionary Genetics Laboratory at VCU on the genomics of ecological speciation and local adaptation in southwestern white pine (Pinus strobiformis). He served (2018-2020) as a plant phylogenomics postdoc in the Muchhala Lab at the University of Missouri–St. Louis (UMSL)

Justin is an evolutionary biologist focusing on problems in molecular ecology and biodiversity science – particularly the use of genome-wide SNP and sequence capture data (Hyb-Seq, UCEs) to understand how historical and ecological processes shape the spatial and temporal distributions of biodiversity in freshwater and terrestrial environments. Current research projects focus on phylogenomics, molecular phylogeography, speciation, and local adaptation in North American and Neotropical plants (forest trees, Neotropical bellflowers) and freshwater fishes (various Neotropical fish groups, North American suckers).

Justin is a reviewer for Systematic Biology, Molecular Ecology, Molecular Phylogenetics and Evolution, PeerJ, Proceedings of the Royal Society B, and a dozen other journals in ecology and evolutionary biology.