Good Will Hunting Cast: Every Role and Cameo, Fact-Checked
Few films make you want to re-check the credits as often as Good Will Hunting — partly because the cast is so compact that every face seems to matter. Matt Damon anchors it as Will Hunting in the American Film Institute catalog, and the ensemble around him turns a Boston story into a showcase of very different acting careers.
Principal cast: 5 ·
Supporting and cameo roles covered: 23 ·
Source domains cited: 5
Quick snapshot
- Matt Damon plays Will Hunting, the film’s central character (American Film Institute catalog)
- Robin Williams plays Sean Maguire, the therapist assigned to work with Will (IMDb title page)
- Stellan Skarsgård plays Professor Gerald Lambeau (Cinema.com cast listing)
- Some minor credits vary by database, and background MIT students aren’t named in every cast guide (IMDb Reference View)
- Vik Sahay is credited as an MIT student, with the alternate billing Vic Sahay in the IMDb Reference View
- George Plimpton’s psychologist is named Henry Lipkin in some cast listings (Cinema.com)
- The American Film Institute catalog records the film’s 1997 release, placing the cast at a specific career moment
- Damon and Affleck were still rising names; Williams was already an established star (American Film Institute catalog)
- For a full credit check, compare the AFI catalog with the IMDb Reference View, both referenced throughout
- People’s cast retrospective tracks where the principal actors have landed since the film
Ten names, one pattern: the closer a role sits to the poster, the more the records agree — the five leads are consistent across sources, while the supporting names start to split by database.
| Actor | Role | Source |
|---|---|---|
| Matt Damon | Will Hunting, a self-taught mathematical prodigy from South Boston | American Film Institute catalog |
| Robin Williams | Sean Maguire, the therapist assigned to work with Will | IMDb |
| Ben Affleck | Chuckie Sullivan, Will’s closest friend | Wikipedia’s film article |
| Stellan Skarsgård | Professor Gerald Lambeau | Cinema.com |
| Minnie Driver | Skylar, a British Harvard student and Will’s romantic interest | People |
| Casey Affleck | Morgan O’Mally | Cinema.com |
| Cole Hauser | Billy McBride | Cinema.com |
| George Plimpton | Court-ordered psychologist (Henry Lipkin in some listings) | Cinema.com |
| Scott William Winters | Clark, a Harvard student who argues with Will | Wikipedia |
| Bruce Hunter | NSA agent who interviews Will | Wikipedia |
Who’s Who in the Principal Cast
The five leads
- The five principal roles split between Will’s South Boston world and the institutions trying to claim him
- Damon, Williams, and Affleck share the film’s emotional core; Skarsgård and Driver enter from the outside
Matt Damon plays Will Hunting, the self-taught mathematical prodigy from South Boston that the American Film Institute catalog places at the center of the film. Robin Williams plays Sean Maguire, the therapist assigned to work with Will, per the IMDb title page.
Five roles, two worlds: the people Will trusts and the professionals who want something from him — and the film’s tension comes from the collision.
Ben Affleck plays Chuckie Sullivan, Will’s closest friend and construction co-worker, according to Wikipedia’s film article. Stellan Skarsgård plays Professor Gerald Lambeau, the MIT mathematics professor who recognizes Will’s talent, per Cinema.com’s cast listing, and Minnie Driver plays Skylar, a British Harvard student and Will’s romantic interest, according to People’s cast retrospective.
The pattern: the casting sets raw South Boston energy against Cambridge credentials, which is why so many conversations in the film feel like a status negotiation.
Supporting Roles: Will’s Crew and the Authority Figures
Will’s South Boston crew
- Casey Affleck
- Cole Hauser
- John Mighton
Casey Affleck plays Morgan O’Mally and Cole Hauser plays Billy McBride, the friends who round out Will’s crew, with John Mighton as Tom, Professor Lambeau’s assistant. All three credits come from Cinema.com’s cast listing.
The authority figures around Will
- Judge Malone
- The prosecutor
- The court-ordered psychologist
- The NSA agent
- Clark, the Harvard student
Wikipedia’s film article places Clark — played by Scott William Winters — as the Harvard student who argues with Will, and credits Bruce Hunter as the NSA agent who interviews him (Wikipedia’s article on the film). George Plimpton plays the court-ordered psychologist, a role some listings name Henry Lipkin, while Jimmy Flynn plays Judge Malone and Joe Cannon plays the prosecutor in Will’s court sequence, all noted in the Cinema.com and IMDb reference lists.
Every institution that tries to fix Will fails until Sean reaches him — so the supporting bench isn’t decoration, it’s the obstacle course.
The implication: academia, the courts, and national security all get named, credited faces, which is why the film’s Boston feels dense rather than empty.
Cameos and Minor Credited Roles
The credits you might miss
Background roles here aren’t anonymous — the barbershop quartet alone has four credited performers, and only the reference views show most of them.
The IMDb Reference View fills in the margins: Rachel Majorowski as Krystyn, Colleen McCauley as Cathy, Jimmy Flynn as Judge Malone, Joe Cannon as the prosecutor, Alison Folland and Derrick Bridgeman as MIT students, Jennifer Deathe as Lydia, Kevin Rushton as a courtroom guard, and the barbershop quartet played by Matt Mercier, Ralph St. George, Rob Lynds, and Dan Washington.
Cameos with a longer story
- Francesco Clemente
- Harmony Korine
- Philip Williams and Patrick O’Donnell
Cinema.com’s cast listing adds Francesco Clemente as a hypnotist, Harmony Korine as Jerve, Philip Williams as head custodian, Patrick O’Donnell as assistant custodian/Marty, and George Plimpton as the court-ordered psychologist some listings call Henry Lipkin.
Why this matters: with names attached to nearly every face, the credits become a game of spot-the-actor — and that depth is a big reason the film still rewards a rewatch.
Confirmed Facts vs. What’s Still Unclear
The principal roles are locked down tightly across sources. The minor credits are where the records start to split.
Confirmed facts
- Matt Damon plays Will Hunting (American Film Institute catalog)
- Robin Williams plays Sean Maguire (IMDb)
- Stellan Skarsgård plays Professor Gerald Lambeau (Cinema.com)
- Casey Affleck and Cole Hauser play Morgan and Billy (Cinema.com)
- Jimmy Flynn and Joe Cannon appear in the court sequence as judge and prosecutor (IMDb Reference View)
- The barbershop quartet is credited to Matt Mercier, Ralph St. George, Rob Lynds, and Dan Washington (IMDb Reference View)
What’s less certain
- Ben Affleck as Chuckie Sullivan — verified here through Wikipedia’s film article rather than a primary studio record
- Minnie Driver as Skylar — confirmed in People’s cast retrospective, but the verified source set is thinner than for the leads
- George Plimpton’s character — named Henry Lipkin in some cast listings, but the naming varies by database
- Scott William Winters as Clark and Bruce Hunter as the NSA agent — both traced to Wikipedia’s cast and plot summary
- Vik Sahay’s billing — the IMDb Reference View shows Vik in one place and Vic in the alternate listing
- Harmony Korine as Jerve — a medium-confidence credit that appears in Cinema.com’s cast listing but not in every record
A credit that shows up in only one database is a lead, not a lock. Cross-check the AFI catalog and the IMDb Reference View before repeating a minor-role name.
The trade-off: the bigger the name, the easier the verification. The deeper into the credits you go, the more you’re depending on whichever database happened to transcribe the credit correctly.
Matt Damon’s role is locked across sources; for Vik Sahay’s alternate billing, treat the credit as a lead until cross-checked.
The Lines That Still Get Quoted
Two exchanges have outlived the credits, and both belong to the film’s two leads.
“How do you like them apples?”
Will Hunting (Matt Damon), in the bar argument with Clark
“It’s not your fault.”
Sean Maguire (Robin Williams), in the therapy office
Wikipedia’s article on the film preserves both exchanges in its plot summary, which makes them easy to verify if you want the exact wording.
The lines people still say out loud belong to the two actors with the most screen time — a reminder that casting is the movie.
Good Will Hunting’s cast is a study in contrast: a comedy veteran playing the therapist, a rising Boston actor playing a genius who can’t get out of his own way, and a supporting bench of friends, professors, and court officials who make South Boston feel real. For a fan checking the credits today, the choice is straightforward: lock in Matt Damon’s credit with the AFI catalog and Robin Williams’s with IMDb, but treat the minor credits like Vik Sahay’s as a cross-checking exercise — or you’ll repeat a listing quirk as fact.
Frequently asked questions
Who plays Will Hunting in Good Will Hunting?
Matt Damon plays Will Hunting, a self-taught mathematical prodigy from South Boston, per the American Film Institute catalog.
Who plays Sean Maguire, Will’s therapist?
Robin Williams plays Sean Maguire, the therapist assigned to work with Will, per the IMDb title page.
Who plays Skylar in Good Will Hunting?
Minnie Driver plays Skylar, a British Harvard student and Will’s romantic interest, according to People’s cast retrospective.
Who plays Chuckie Sullivan?
Ben Affleck plays Chuckie Sullivan, Will’s closest friend and construction co-worker, according to Wikipedia’s article on the film.
Who plays Professor Lambeau?
Stellan Skarsgård plays Professor Gerald Lambeau, the MIT mathematics professor who recognizes Will’s talent, per Cinema.com’s cast listing.
Is Casey Affleck in Good Will Hunting?
Yes — Casey Affleck plays Morgan O’Mally, one of Will’s South Boston friends, alongside Cole Hauser as Billy McBride.
Who is the NSA agent in Good Will Hunting?
Bruce Hunter plays the NSA agent who interviews Will, according to Wikipedia’s article on the film.
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