Joan R Callahan

JOAN R. CALLAHAN is the award-winning author of numerous biological journal papers, environmental science documents, science and engineering books, and magazine articles. She received her doctorate in zoology from the University of Arizona and has worked as a consultant and researcher, most recently with a grant from the USGS Biological Resources Division. Her latest book is Recent Advances and Issues in Environmental Science (Oryx Press, 2000).

JOAN R. CALLAHAN is the award-winning author of numerous biological journal papers, environmental science documents, science and engineering books, and magazine articles. She received her doctorate in zoology from the University of Arizona and has worked as a consultant and researcher, most recently with a grant from the USGS Biological Resources Division. Her latest book is Recent Advances and Issues in Environmental Science (Oryx Press, 2000). See less