Joel GreenbergJoel Greenberg is a Research Associate of the Chicago Academy of Sciences Peggy Notebaert Nature Museum and the Field Museum. Author of three books, including A Natural History of the Chicago Region, Greenberg has taught natural history course for the Morton Arboretum, Brookfield Zoo, and Chicago Botanical Gardens. He helped spearhead Project Passenger Pigeon to focus attention on human-caused extinctions. Greenberg lives in Westmont, Illinois. He blogs at Birdzilla.com and you can find more about Project Passenger Pigeon at http://passengerpigeon.org Read More Read Less