With Christopher Nolan's new film Oppenheimer now in cinemas, audiences are getting a chance to understand the history behind the takes on the renowned 'Father of the atomic bomb', AKA J. Robert Oppenheimer.

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However, that's not all. The film also explores the stories of several other important individuals involved in the Manhattan project, and those whose lives intersected with Oppenheimer's.

One of the most central figures the film explores is Leslie Groves, a lieutenant general in the United States Army and the project's director.

He is played by A-list star Matt Damon, who joins the rest of the star-studded cast led by Cillian Murphy.

The film has already been a box office hit in its opening weekend – even if it couldn't compete with the mammoth numbers Greta Gerwig's Barbie secured.

But just who is Damon's character Groves, and what was his role in the Manhattan Project which led to the creation of the atomic bomb? Read on for everything you need to know about Damon's Oppenheimer character.

Who was Leslie Groves?

American Major General Leslie Groves (1896 - 1970), while in charge of the Manhattan Engineer District, he oversaw the building of facilities for testing of the first atomic weapons.
1944: American Major General Leslie Groves (1896 - 1970), while in charge of the Manhattan Engineer District, he oversaw the building of facilities for testing of the first atomic weapons. MPI/Getty Images

Groves was a lieutenant general in the United States Army and director of the Manhattan Project.

He was born in 1896 in Albany, New York, and entered the Army Corps of Engineers in 1918, where he took on a series of supervisory positions.

From 1940 to 1942, Groves oversaw all army construction in the United States, which involved building camps, airfield, depots and the Pentagon – an immense engineering and administrative effort that earned Groves a reputation as someone with management genius.

In mid-1942, the Army Corps of Engineers was put in charge of the Manhattan Project and, in September 1942, Groves was appointed as its head.

Groves oversaw all aspects of scientific research and technical development for the atomic bomb, as well as a vast security and intelligence operation.

Matt Damon is Leslie Groves and Cillian Murphy is J. Robert Oppenheimer in OPPENHEIMER, written, produced, and directed by Christopher Nolan
Matt Damon as Leslie Groves and Cillian Murphy as J. Robert Oppenheimer in Oppenheimer. Universal Pictures

These responsibilities put Groves at the centre of the planning, targeting and timing of the attacks on Hiroshima and Nagasaki in August 1945.

One of his subordinates, Kenneth Nicholls, described Groves as "the biggest S.O.B. I have ever worked for. He is most demanding. He is most critical. He is always a driver, never a praiser. He is abrasive and sarcastic. He disregards all normal organisational channels. He is extremely intelligent."

He continued: "He has the guts to make timely, difficult decisions. He is the most egotistical man I know. He knows he is right and so sticks by his decision. He abounds with energy and expects everyone to work as hard, or even harder than he does… if I had to do my part of the atomic bomb project over again and had the privilege of picking my boss, I would pick General Groves.”

What happened to Leslie Groves?

Groves retired from the army in February 1948 and took up a position with Remington Rand.

In 1962, he penned Now It Can Be Told, describing his experience of overseeing the Manhattan Project.

Groves died of heart disease on 13th July, 1970.

Why did Leslie Groves choose Oppenheimer?

Army-Navy Award of excellence presented by General L. R. Groves to Director Robert Oppenheimer, circa 1940s.
Army-Navy Award of excellence presented by General L. R. Groves to Director Robert Oppenheimer, circa 1940s. Fotosearch/Getty Images

It was Groves who hired Oppenheimer to head up the secret laboratory where the bomb would be tested and lead the research team.

Grove selected Oppenheimer despite rumours that the scientist had ties to the Communist Party.

"He's a genius, a real genius," Groves told a reporter of the scientist years later. "Why, Oppenheimer knows about everything. He can talk to you about anything you bring up. Well, not exactly, I guess there are a few things he doesn't know about. He doesn't know anything about sports."

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Oppenheimer is now showing in UK cinemas. Check out more of our Film coverage or visit our TV Guide to see what's on tonight.

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