The Transportation Security Administration has been operating without an administrator since President Obama's election. Executivegov.com reports that retired Major General Robert Harding is to be announced by Department of Homeland Security Secretary Janet Napolitano later this afternoon.
Harding is well known in the intelligence community, having served in a variety of U.S. Army intelligences posts. Upon his retirement from the Army, he was Executive Vice President of INNOLOG, before starting Harding Associates. In 2008 he sold the firm to Six3 Systems. It's unknown if acting Administrator Gale D. Rossides will stay on the TSA.
The TSA has been under significant scrutiny and criticism by various members of Congress. The White House has been vocal about Congress holding up confirmations of several key posts in government since President Obama's inauguration. Errol Southers who was nominated in January, withdrew after political bantering back and forth between the White House and Republicans.
Update: C-SPAN video of Secretary Napolitano announcing TSA nomination of Robert Harding
Additional resources: Human x-ray machines: Coming soon to an airport near you