About DoD CIO

Chief Information Officer

Terry Halvorsen  Mr. Terry Halvorsen is the Department of Defense Chief Information Officer (CIO).  In this capacity, he is the principal advisor to the Secretary of Defense for information management, information technology, and information assurance, as well as non-intelligence space systems, critical satellite communications, navigation and timing programs, spectrum, and telecommunications. He assumed duties as the DoD CIO effective March 2015, having previously served as the Acting DoD CIO. Prior to this position, he was the Department of the Navy CIO.


» Biography

Dr. John Zangardi Dr. John Zangardi became the Principal Deputy CIO on October 2, 2016. As the Principal Deputy, Dr. Zangardi assists the DoD CIO as the primary advisor to the Secretary of Defense for Information Management / Information Technology and Information Assurance as well as non-intelligence space systems; critical satellite communications, navigation, and timing programs; spectrum; and telecommunications.


» Biography

Organizational Chart

DoD CIO Org Chart


The Department of Defense Chief Information Officer is the Principal Staff Assistant and senior Information Technology advisor to the Secretary of Defense.  This role includes overseeing many national security and defense business systems, managing information resources, and finding efficiencies. It is responsible for all matters relating to the Department’s information enterprise, including:
  • Communications
  • Spectrum management
  • Network policy and standards
  • Information systems
  • Cybersecurity
  • Positioning, navigation, and timing policy
  • DoD information enterprise that supports DoD command and control
DoD CIO Charter

DoD IT Environment - Way Forward to Tomorrow's Strategic Landscape


  • Who is in DoD’s information technology user base?
  • What is in the Department’s IT budget?
  • What is the Defense Information Systems Agency?
  • What are the Joint Regional Security Stacks?
Answers can be found at Frequently Asked Questions page.