Eric O'Neill
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Eric O'Neill is a former FBI analyst who, in the final months of the FBI's investigation of senior counterintelligence officer Robert Hanssen, was placed as Hanssen's nominal assistant in order to observe him for tradecraft slip-ups that would confirm him as the mole.

Per John Kiriakou, O'Neill was not in fact an assistant: "Eric O'Neill was actually there to spy on Hanssen to see if there were any slip-ups that would indicate that he was the mole."

After the arrest

The operation's psychological toll was significant. Per Kiriakou: "The stress was so awful in this case that he quit the FBI after Hanssen was arrested."

Breach

The 2007 film Breach portrays the operation with O'Neill as protagonist. Per Kiriakou: "Eric O'Neill is a hero in this movie."

See also

- Robert Hanssen
- Brian Kelley, the wrongly-framed CIA counterintelligence officer
- Harold James Nicholson, the contemporaneous third mole

See also

- Robert Hanssen
- Brian Kelley
- Harold James Nicholson
