Dewey was a CIA front who had attempted to enlist David Webb into Treadstone, founded by Webb's father, Richard. When Richard prohibited his son into Treadstone, he had an assassin, dubbed the Asset to kill Richard, staging it as a terrorist attack. After the events of The Bourne Ultimatum, when David - under the name Jason Bourne exposed Blackbriar, Dewey took over Ezra Kramer's position as CIA Director after his arrest. Sometime between 2004 and 2016, Dewey had created "Iron Hand", the codename for a CIA program intended to be a reboot of the Treadstone, Blackbriar, Outcome and LARX projects.
In 2016, Dewey and CIA Cyber-Ops Division Head Heather Lee were present when a CIA hacking orchestrated by Nicky Parsons occurred. In the light of this, Dewey ordered a manhunt for Parsons, under the belief that she had contacted Bourne for a meeting at a civil riot in Syntagma Square. When CIA teams failed to apprehend and kill them, Dewey planted the Asset to assassinate them both: In the outcome, after a vehicular chase across Athens, Parsons was shot dead but Bourne escaped with the keys to a safe deposit box with CIA files and a hard drive Parsons chucked at him before she was killed.
In the aftermath of the Greece incident the following day, Dewey - while in a meeting with Edwin Russell, the Director of National Intelligence, Lee walked in and as explained her plan to Dewey: Contact Bourne under the belief that she could persuade him back into the CIA as an agent. Dewey seemingly accepts with glee and Lee leaves the room. Dewey and his right-hand man Craig Jeffers are the only two who remain in the room, leaving them to discuss their true intentions.
At a café, Dewey arranged a meeting with Aaron Kalloor, a public face of corporate social responsibility in an attempt to ally with him for a public debate about privacy rights, but secretly plans to use his enterprise Deep Dream as a mass-surveillance program for Iron Hand: After a negotiation, Kalloor reluctantly accepts before he leaves the café.
After killing Dewey's team and one of his top assassins, Dassault, Bourne uses the few leads that he gained in Berlin, Bourne tracks Malcolm Smith, a former Treadstone surveillance operative at London, England and arranges him to meet him at Paddington Plaza. During their meeting, Smith reveals Bourne that his father David had created the Treadstone program but actually attempted to prevent them to recruit Bourne himself.
He adds in his things, saying that Dewey ordered the Asset to kill Richard and staged his death as a terrorist attack to persuade Bourne to join into the Treadstone program. After the confrontation, the Asset assassinates Smith while Bourne escapes and finds Lee, whom she isn't feeling comfortable with Dewey's methods and directs him to a technology convection called EXOCON at Las Vegas, Nevada.
At the convection, Dewey is scheduled to attend the convection for a public debate on privacy rights with Kalloor which is the public face. He was secretly funded by Dewey who intends to carry out his true plan; use the Deep Dream for real-time worldwide massive surveillance systems alongside the reborn programs Treadstone, Outcome, Blackbriar and LARX, now collectively known as "Iron Hand". Suspecting that Kalloor will refuse to allow the CIA's access to Deep Dream, Dewey orders the Asset to take down Kalloor and Lee which he no longer trusts. Unfortunately, Bourne stops the assassination.In the midst of the thwarted shooting, Jeffers insisted that Dewey escape in a vehicular escort, but Dewey chose to remain his ground on an upper floor. Bourne tracked him to his room and threatened him by pinning him against a wall: Knowing that his agents were closing in, Dewey stalled for time with Bourne, distracting him through a speech about patriotism.All of a sudden, Jeffers barged into the room in an attempt to rescue Dewey and knocked down Bourne, but Bourne shot him dead. Dewey used the distraction to his advantage as he prepared his handgun to shoot Bourne. However, before he could deliver the finishing kill, Lee arrived and shot Dewey, killing him.
- Dewey actually served as the true primary antagonist of the entire Bourne franchise because of the reason that he killed Richard Webb, orchestreared many assassinations over the years even if there were many different CIA directors such as Ward Abbott, Noah Vosen and more, Dewey led every single thing in order to carry out his plan to turn the program "Iron Hand" worldwide as surevilliance systems. Thus, he is also considered to be Bourne's biggest nemesis following the reason that he had killed his own father.
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