Daniel began his career in biology as an undergraduate at the University of Chicago. He completed his doctoral work in evolutionary biology with Paul Harvey at Oxford University. After post-doctoral work in Paris, at Queen's University in Ontario, and at the University of Minnesota, in 1995 he joined the faculty in the Department of Genetics at the University of Georgia. Daniel moved to the University of Washington in July 2013, where he is professor in the Departments of Pathology and Biology. Daniel is broadly interested in evolutionary genetics, with a particular focus on projects related to aging, as well as studies on sexual selection, natural genetic variation, networks, and metabolomics. Daniel is the Principal Investigator of the Dog Aging Project , an NIH-funded long-term longitudinal study of the biological and environmental determinants of healthy aging in companion dogs.