At Yale, Cohen helped found the International Working Group on Children and War,[1] and the Yale-New Haven Child Development Community Policing Program, to train first responders to help children exposed to violence and trauma;[2] police were trained to call in the Yale Child Study Center professionals in instances of violence or trauma involving children.[3] Martin said, "he dedicated much of his later career to addressing the mental health needs of children in poor and war-torn nations".[5]