By Gautham Nagesh - 05/19/11 10:33 PM EDT
Currently the president of his own consulting firm, Gilligan is credited with radically improving the Air Force's network security while cutting costs about $100 million a year. He has also worked as senior vice president of SRA International and CIO of the Energy Department.
Immediately before joining DHS two years ago, Reitinger spent six years as chief trustworthy infrastructure strategist for Microsoft. He has also worked for the Pentagon and spent more than a decade at the Justice Department.