David Vlahov ( born August 31 , 1952 ) is an American epidemiologist and professor emeritus at the UCSF School of Nursing , of which he previously served as dean from April 2011 to August 2016 . He is also the editor-in-chief of the '' Journal of Urban Health '' , and has been a member of the National Academy of Medicine since 2011 . He is known for researching issues related to social determinants of health , such as the effectiveness of needle exchange programs . With Sandro Galea , he has also researched psychological responses to the September 11 attacks among residents of New York City
September 11 attacks
September 11 attacks
David Vlahov