David Hemenway is a professor of public health at the Harvard School of Public Health. He is the author of Private Guns, Public Health which argues that there are many practical ways to significantly reduce the epidemic of American gun deaths. In his book While We Were Sleeping Success Stories in Injury and Violence Prevention, David provides case studies of previous efforts at reducing injuries and deaths, showing 60 different success stories that have made us all safer.David previously worked for Ralph Nader and compares the situation with guns to the situation before auto safety measures came about. He has produced a great deal of research on what interventions would actually work to stop people from getting shot. Today he joins to discuss what we know (and don't know) about firearm deaths and how to stop them.