Prof Vickie Mays (UCLA& AJPH) and Alfredo Morabia (EIC, AJPH) asked Barry S. Levy (Tufts University School of Medicine, and former APHA president) and Bob Gould (APHA Peace Caucus and former president of Physicians for Social Responsibility) what is the public health dimension of wars, why wars are always global, and what can public health professionals do to prevent wars and to attenuate their consequences.