Philip J. Cook is a professor of public policy, sociology, and economics at Duke University in the United States. His research has focused on firearms and crime, as well as alcohol abuse and related problems. Cook is the author of "Gun Violence: The Real Costs", a book published by Oxford University Press, that presents gun violence from an economic perspective. Wikipedia
The definitive Wikipedia entry for Philip J. Cook. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Philip_J%2e_Cook