Former DHS Leader Shares Details on SolarWinds Attack Twitter Chad Wolf is the former acting secretary for the Department of Homeland Security. Chad Wolf, the former acting secretary for the Department of Homeland Security, has confirmed the accuracy of an earlier news report saying that the SolarWinds supply chain attackers gained access to his unclassified DHS email accounts, which included calendar details. Speaking Monday at a Heritage Foundation virtual event, Wolf said that when he was told about the SolarWinds breach by DHS and the Cybersecurity and Infrastructure Security Agency, he began to realize the scale of what had happened and the breadth of the attack.