Cillian Murphy on becoming Oppenheimer: “I didn’t go out much – I didn’t socialise”

If you’ve ever read an interview with the Irish actor Cillian Murphy, you might think him shy, irritable, or even neurotic. Journalists love to write about how closed-off he is, that if you ask him anything too personal he’ll shut down and give one-line answers. This makes their job very hard, they say. But what those interviews don’t tell you, is that if you let Murphy talk about a subject that he actually wants to talk about – such as his epic new film about the father of the atomic bomb J. Robert Oppenheimer – he’ll go on for ages. And he’ll be very open and interesting while he’s doing it. He might even make a joke.

• Read more: Oppenheimer review: Christopher Nolan’s mind-blowing biopic hits like a bomb to the brain

He does this when NME meets him at a posh hotel in Soho. We’ve just walked into the room. Murphy is sat down, wearing a black v-neck jumper over a white t-shirt, black trousers and a pair of very pointy Chelsea boots. He seems relaxed, and greets us with a cheery “hello!”. Then he recognises the thick paperback tucked under our arm as a copy of American Prometheus, the Pulitzer Prize-winning biography from which Oppenheimer is adapted. We’d intended to read a quote from the book later but Murphy cuts in on our explanation. “No, you brought it in here to be pretentious,” he grins. “Would you like me to sign it for you?”

There are people who would sell their grandmas for a mere glimpse of Murphy, let alone an autograph. He’s been dogged by screaming fans since the early days of his career – when he broke out as often-shirtless apocalypse survivor Jim in Danny Boyle’s 2002 horror hit 28 Days Later. Brummie gangster series Peaky Blinders made him a global star, but his most famous film roles are notable because they’ve often come from collaborations with the same director. Christopher Nolan’s sci-fi blockbuster Inception, war thriller Dunkirk and his Batman trilogy all featured Murphy as the supporting curio – a side character that pops up every so often to steal your attention from the main protagonist. But in Oppenheimer, the duo’s latest creative partnership, he finally is the main character.

And he’s a good one too. Oppenheimer was an American scientist who made vital discoveries in quantum physics during the 1920s and ‘30s, going on to oversee the creation of the atomic bomb for the US Government – two of which were dropped on Japanese cities Hiroshima and Nagasaki in 1945, killing an estimated 220,000 people. Oppenheimer spent the rest of his life campaigning for disarmament, appalled at the weapon (his preferred term was “gadget”) he had helped to give the world. He also drank heavily and had a reputation as a womaniser, despite being quiet and sometimes socially awkward. Murphy calls him “contradictory” and “complex”, which is like saying Suella Braverman doesn’t like immigrants. “I do think that he believed it would be the weapon to end all wars,” Murphy continues, attempting to explain how a left-leaning humanitarian could spend two years perfecting the ultimate killing machine. “He thought that [having the bomb] would motivate countries to form a sort of nuclear world governance.” Murphy pauses. “He was naive.”

Was that naivety a choice though? Oppenheimer had an explosive ego, once attempting to poison a university professor who chastised him when he was a student. Could his desire to achieve such as historic breakthrough have led him to ignore his own better judgement?

“That’s an interesting take,” says Murphy. He runs his hands through his hair, which is styled into wavy curtains. He does this a lot when thinking a question over. “Chris used this amazing phrase. We were talking about Oppenheimer’s arc and he said, ‘You know, he’s dancing between the raindrops morally.’ That unlocked something in my mind when I was preparing.”

“I was skipping meals”

To play the role of Oppenheimer, Murphy went very deep. He read the Bhagavad Gita – a 700-page Hindu religious text that the physicist famously quoted from (“Now I am become Death, the destroyer of worlds.”) Then he started “skipping meals” in an effort to slim down to Oppenheimer’s rail-thin frame. During the actual shoot, Murphy smoked so many fake cigarettes that he worried it harmed his health. “They can’t be good for you,” he told The Guardian. Oppenheimer himself died of throat cancer in 1967.

On top of the physical strain, Murphy delved into some pretty dark emotional places. He had six months to research before filming began in February 2022, and during the 67-day production he often worked 18-hour days. War, genocide and the nuclear holocaust are unpleasant to think about at the best of times, never mind your every waking moment. It must have been brutal.

“You always have to take a holiday after a job,” he concedes, as though being a Hollywood actor is no different from plumbing toilets. “It’s not because… as some journalists like to think, you’re a method actor or whatever. It’s because you give so much time to the job and then suddenly you stop. You have all this displaced energy, you know, so you kind of don’t know what to do with yourself… But I’m a very easygoing sort of person. It doesn’t weigh me down.”

We suspect Murphy isn’t being entirely truthful here. Such is the intensity of his performance – all simmering discontent and wide-eyed panic attacks – that it’s difficult to believe he just shook the weight of global armageddon off each night before climbing into bed. Emily Blunt, who plays Oppenheimer’s wife Kitty in the film, has said Murphy regularly skipped cast dinners because of the “monumental” pressure he felt. “Of course he didn’t want to [eat] with us,” she told People magazine. Matt Damon, brilliant as mustachioed military boss General Groves, agreed: “His brain was just too full.” When we push Murphy on the subject, he reveals a little more. “I didn’t go out much. I didn’t socialise much, mainly because of the amount of work I had to do… I became so immersed in the role.”

To make the experience yet more profound, cameras rolled only “a couple of days” before Russia invaded Ukraine. The West united to impose stringent economic sanctions on Vladimir Putin and his people. The value of the Ruble plummeted, Russian billionaires were booted out of London and Moscow became a cultural ghost town with the likes of Green Day and Iron Maiden cancelling gigs. Putin’s response? To start lining up tactical nukes along his borders. Armageddon seemed closer than at any moment since the Cold War. Murphy (and his castmates) felt the heat. “It was everywhere, and we were fully aware of that,” he says. “The threat [of nuclear war] has escalated and receded over the years since 1945… and now it’s back. It’s always there, this Sword Of Damocles that is hanging over us.”

Murphy, 47, knows what it’s like to exist against the backdrop of conflict. He grew up during the Troubles in late 1970s and ‘80s Cork, Ireland, where reports of sectarian violence in the north often dominated the news. His mum was a French teacher and his dad worked for the civil service. As a teenager, he was obsessed with music. He read NME and loved Frank Zappa and The Beatles. To illustrate his fandom, he tells us about a trip he took to Liverpool, later in life, to see the legendary Cavern Club, where the mop tops first cut their teeth on stage. “I walked down to [the street where the Cavern Club is supposed to be],” he says, “and it wasn’t there. It was somewhere over there!” He gesticulates with his hands. “It’s not the real Cavern. It’s just a mock-up!”

Inspired by John, Paul, George and Ringo, Murphy and his brother formed a band: The Sons of Mr Green Genes, named after a Zappa tune from the avant garde groover’s 1969 album ‘Hot Rats’. The songs were similarly experimental, filled with “wacky lyrics and endless guitar solos”. Eventually, an indie label based in London, Acid Jazz, put a five-album deal on the table. He and his brother turned it down, citing reasons of artistic independence, but for a while rock and roll appeared more inviting than the movies.

“I just never thought that I was good enough”

Murphy is often disparaging about his songs to journalists, but they must have been doing something right. He’s also self-deprecating when we bring up the underrated 2002 short film Watchmen, which he co-wrote with BAFTA-winner Paloma Baeza – his only attempt at a screenplay. “I just never thought that I was good enough really,” he says. “It’s why I haven’t, you know, pursued the music either… I like to do one thing quite well.” He adds that it’s unlikely this will change in the future.

Murphy will be far too busy to write songs or screenplays for a while anyway. The first reviews for Oppenheimer are out, and some critics have him earmarked for an Oscar. He’ll charm his way through awards season no doubt, just as he does at the Paris premiere the night before our interview. Done up in a black suit with mustard shirt and matching oversized tie, he looks a bit like the handsome English teacher your best mate had a crush on. Walking the red carpet, he is happy to answer questions, speaking at length about Nolan’s genius and the “amazing” reaction to Oppenheimer so far. You can tell he’s enjoying himself.

Murphy’s not on duty tonight though, with London’s premiere scheduled for the day after our chat. Then he’ll be waiting to get on with his next gig, the dark indie drama Small Things Like These, adapted from Claire Keegan’s bestselling 2021 title, in which he’ll take the lead role. Following his breakthrough blockbuster with a low-key Irish drama is typically understated of Murphy, so not unexpected. More box office projects loom on the horizon – a standalone Peaky Blinders movie and the long-awaited horror threequel 28 Months Later – but he says he has “no new information” on either.

It’s difficult to say what Oppenheimer means for Murphy. He is a household name in the UK and Ireland, but less so in the States, where some still see him as a ‘TV actor’. In a recent interview to promote the film, Robert Downey Jr. talked of Murphy’s life “changing” after Oppenheimer, as if he’s a fresh actor on the scene. In a sense, Downey Jr. is right. This is Murphy’s first lead role in a sure-fire smash. And the parts he gets offered now may be a bit starrier. But don’t expect to see him in spandex on a Marvel soundstage anytime soon.

“I like unknowable, ambiguous, kind of enigmatic [characters],” he says. “To me that’s human life: the knotty, weird grey areas… A good man’s life is wholly uninteresting.”

‘Oppenheimer’ releases in UK cinemas on July 21

Photographer: Marco Grob for Universal Pictures

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