Mark Bristow is the Branch Chief for Cyber Defense Coordination within Threat Hunting subdivision in the Cybersecurity and Infrastructure Security Agency (CISA) within the Department of Homeland Security (DHS). He oversees DHS's efforts for assisting asset owners to respond to, remediate and recover from cyber incidents across government, critical infrastructure and private sector systems—most recently including securing the election infrastructure and addressing Russian attempts to gain access to the U.S. power grid. Mr. Bristow joined DHS in 2008, working as a contract Incident Responder and then was promoted to Chief, Incident Response and Management for the Industrial Control Systems Cyber Emergency Response team (ICS-CERT). Mark later served as Deputy Director and then Director of the NCCIC Hunt and Incident Response Team (HIRT). He has prior experience conducting ICS assessments and penetration tests in multiple sectors.