In Washington, O'Neill became part of a close-knit group of counter-terrorism experts which formed around Richard Clarke.
Some counter-terrorism experts have expressed doubt that the plot was ever fully developed or likely to occur.
There's a moment when a counter-terrorism expert portentously announces that a wad of green rubberized cloth found at the crime scene suggests some ominous foreign involvement in Iowa.
John P. O'Neill was a counter-terrorism expert and the Assistant Director of the FBI until late 2001.
He continues to perform threat analyses for both public and private sector clients, and is considered a counter-terrorism expert.
In 2011, a self-proclaimed counter-terrorism expert who claimed the film was based on a real-life incident that killed his daughter was convicted of wire fraud.
If we brought in a counter-terrorism expert from Washington, we would have had to embark on a protracted learning program to teach him about the waterways.
A secret Moscow meeting of Soviet and US counter-terrorism experts in June was followed by another in California in September.
A book by a former Scottish counter-terrorism expert has been blocked by Scotland's Attorney General.
Jean-Charles Marchiani is a counter-terrorism expert, especially focused on Islamic fundamentalism.