Joan R. Callahan

Joan R. Callahan, PhD, holds her doctorate degree in zoology from the University of Arizona, Tucson, AZ. She has worked as a researcher and consultant for over 30 years, most recently as an epidemiologist for the Naval Health Research Center and as a contractor for the National Institute of show more Standards and Technology. Her published works include numerous biological journal papers, environmental reports, and science books, such as Greenwood's Emerging Biological Threats: A Reference Guide and Biological Hazards: An Oryx Sourcebook. show less