The Big Picture

• Josh Hartnett steals the show in Christopher Nolan's Oppenheimer with a nuanced supporting performance.
• Hartnett's character, Ernest Lawrence, plays an important role in Oppenheimer's life and his work on the atomic bomb.
• Hartnett portrays Lawrence with empathy and conviction, showcasing his talent in this comeback role.

Christopher Nolan has a knack for wrangling impressive ensemble casts for his films, but he really outdid himself with his 3-hour historical epic Oppenheimer. Even if the World War II biopic didn’t include the frequent Nolan collaborator Michael Caine, the stacked ensemble is filled with a terrific ensemble of veteran Hollywood stars, Academy Award-winning performers, underrated character actors, relative unknowns, and a few former box office titans that have seemingly disappeared over the last decade or so. It wasn’t that long ago that Josh Hartnett was the marquee lead of films like Lucky Number Slevin and Black Hawk Down, but his star power has seemingly evaporated, as some actors can only maintain the same level of success for so long. However, Hartnett has always been a more interesting and complicated actor than the roles that he was given at the beginning of his career. Hartnett isn’t just in the middle of a major comeback; he basically steals Oppenheimer with one of the most nuanced supporting performances.

Why Is 'Oppenheimer's Ernest Lawrence So Important?

Oppenheimer is told in non-chronological order, in what has become a hallmark of nearly all of Nolan’s films. While Hartnett doesn’t play a significant role in the black-and-white sections that show the confirmation hearings for Lewis Strauss (Robert Downey Jr.), he is instrumental within the main storyline focused on J. Robert Oppenheimer’s (Cillian Murphy) studies at the University of California in Berkeley, where he first conceived of much of the technology that ended up becoming critical within the Manhattan Project. The sequences in Berkeley aren’t just where Oppenheimer unlocks part of his genius, but also where he falls in love with his second wife Kitty (Emily Blunt), and makes a community of friends for the first time. It is during this period that he works hand-in-hand with Hartnett’s depiction of Ernest Lawrence; having an outsider’s perspective on Oppenheimer’s work was necessary for this sequence to function.

Ernest Lawrence was an incredibly influential figure in Oppenheimer’s life. While he’s not someone that Oppenheimer often looks up to and idolizes like Neils Bohr (Kenneth Branagh) or Albert Einstein (Tom Conti), Lawrence represents the sort of man that Oppenheimer could never really become. Hartnett depicts Lawrence as a man of great importance, intelligence, and class who also has a relatively normal social life and shows an ability to adjust to the stresses within his life. Lawrence encourages Oppenheimer to find a balance within his work, but it becomes obvious that it’s not possible for someone with his capacity for genius. It creates an odd tension between them; Lawrence feels both resentful and sympathetic for his friend. Oppenheimer’s inability to simply “turn off” his brain and focus on something other than his work may end up making him more historically important than Lawrence, but it negates any sense of accomplishment or happiness he may feel.

Josh Hartnett does some really outstanding subtle work with his performance, as there’s an interesting dichotomy to Lawrence’s feelings about Oppenheimer. He’s not resentful, as he and Oppenheimer are able to get along and share much in common due to their shared experience in nuclear research. Lawrence is someone who can communicate with Oppenheimer on an intellectual level about the groundbreaking studies that are being done, but he’s not capable of reaching the same next-level conclusions. Lawrence is well-educated and knows what he’s talking about, but also acknowledges that it’s not his name that the world will remember. It was almost a bit of reflective acting on Hartnett’s part as if he was acknowledging that he was no longer the same star who had led Pearl Harbor to its box-office success two decades prior.

Ernest Lawrence Is Important to the Politics of 'Oppenheimer'

Christopher Nolan isn’t necessarily known as a “political filmmaker,” but while his films aren’t necessarily as overt as the work of directors like Oliver Stone or Spike Lee, there are strong anti-war, anti-escalation themes in The Dark Knight, Dunkirk, and Tenet. Oppenheimer is definitely Nolan’s most overtly political work to date, and Lawrence is instrumental in unpacking the film’s complex understanding (and criticism) of the decisions that Oppenheimer made on behalf of his country during his lifetime. At first, Oppenheimer’s relationship with Jean Tatlock (Florence Pugh) is nothing more than a passionate romantic affair, but it's Lawrence who explains the danger that being involved with the socialist political movement at the time that they are in. Lawrence has his personal feelings about the rising Communist movement, but he worries that Oppenheimer’s mind could be distracted when he’s working on studies that could literally change the way that mankind observes the world.

The political differences between Lawrence and Oppenheimer are fascinating, and Hartnett does a great job of showing Lawrence’s conviction in his belief and handling the dense political dialogue. It’s fascinating that Lawrence’s political beliefs aren’t delved into that deeply other than his expressed desire to keep all discussions about the socialist movement out of the classroom. Lawrence tells Oppenheimer that he considered himself a patriot, but he also wants the University to be an institute of science, and not a hangout spot for a potentially dangerous movement to begin. He and Oppenheimer begin to grow further apart as a result of this, but they still share a mutual understanding of which events transcend their own personal beliefs. Both men react with the same surprise and fear when news of Adolf Hitler’s invasion of Poland breaks.

Josh Hartnett does a great job of showing Lawrence’s empathy for Oppenheimer. While he understands that a traditional celebration isn’t necessarily something that Oppenheimer would enjoy, there’s a friendliness between the two men that continues after General Leslie Groves (Matt Damon) whisks him away to work on the Manhattan Project. Lawrence refuses to report incriminating evidence on Oppenheimer during the government’s investigation, and the two are able to shake hands at the end of the film. That’s more than Oppenheimer can say about Edward Teller (Benny Safdie), whose pro-nuclear beliefs created too much of a divide between them.

Josh Hartnett is in the midst of a much-needed comeback, and it’s great to see that Oppenheimer gave him such a nuanced role to execute. While it may have taken a while for him to finally get the chance to work with Nolan, his performance is one that is essential to show what made Oppenheimer tick on both an intellectual and personal level.

Oppenheimer is now available to stream on Peacock in the U.S.

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