 In the late 1970s, he was among the first to introduce mitochondrial (mt) DNA to population biology.This seminal work laid the foundation for phylogeography, a field for which he is recognized as the founding father.Among the many phylogeographic applications for which his laboratory paved the way were genetic assessments of marine and freshwater turtles, catadromous eels, unisexual fishes, and regional assemblages of birds, fishes, mammals, herps, and marine invertebrates.