An official website of the United States Government 
Here's how you know

Official websites use .gov

.gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( lock ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

David McKeown

Acting Principal Deputy Chief Information Officer Department of Defense Senior Information Security Officer (SISO), and Deputy Chief Information Officer for Cybersecurity (DCIO(CS))


Mr. David McKeown serves as the acting DoD Principal Deputy Chief Information Officer, and in the dual role of Deputy DoD Chief Information Officer for Cybersecurity (DCIO(CS)) and DoD Senior Information Security Officer (SISO) per 44 USC 3544. Mr. McKeown supports the Office of the CIO by leading engagement with the Defense Agencies and Field Activities (DAFA), providing oversight of the Defense Information Systems Agency (DISA) and leading strategic resource planning across the information technology (IT) and cybersecurity domains.

As the DCIO(CS) and SISO, he provides expert policy, technical, program, and defense-wide oversight support to the DoD CIO on all cybersecurity matters. He is responsible for leading the DoD-wide cybersecurity program and associated governance processes. He partners with industry to improve cybersecurity and information sharing through the Defense Industrial Base (DIB) and represents the Secretary of Defense and DoD CIO in international discussions and negotiates cybersecurity topics in both bilateral and multi-lateral (alliance and coalition) channels. He leads the development of the cybersecurity investment priorities for the Department and provides planning guidance to Components.

Mr. McKeown has over 35 years of experience in the Department of Defense having served 27 years in the Air Force and 8 years as a government civilian. He spent 21 years as an Air Force Cyberspace Operations officer skillfully leading numerous organizations and high-visibility initiatives to include the Air Force Cybersecurity Program as a member of the Air Staff.

He served as the Director of Enterprise Information and Mission Assurance for the United States Army Information Technology Agency and as the Cybersecurity Center Chief and Enterprise Services Center Chief for the DISA Joint Service Provider in the Pentagon. He led the Pentagon Computer Incident Response Team (PENTCIRT) providing twenty-four-hour-a-day, seven-days-a-week network security monitoring and intrusion detection, attack sensing and warning, and incident response and handling for the Department of Defense's key leadership and staffs.

Mr. McKeown most recently led the Department of Justice’s Service Delivery Staff where he was responsible for the acquisition, development, deployment, operations, and maintenance of Department IT as well as delivery of high quality, customer-centric services to ensure the success of the DOJ and its component organizations.