Industry and government sources confirmed Osborn's last day is Jan. 18.

Osborn joined NNSA as its CIO in January 2011 and spent 26 years in the Marines Corps before working in a variety of civilian positions in the Defense Department for 10 years.

Information Week first reported Osborn's decision to retire.

Osborn led NNSA's efforts to transform its IT infrastructure. The initiative focused on improving and modernizing NNSA's network, creating a joint cybersecurity center and launching a new cyber science laboratory.

He also worked closely with the cloud-of-clouds-approach using a vendor broker model.

Osborn accepted a position with the Alliance for Sustainable Energy at the Energy Department's National Renewable Energy Laboratory to help with the lab's IT transformation.

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