Alan Ladd Jr, the Oscar-winning producer and studio boss who as a 20th Century Fox executive greenlit Star Wars, has died aged 84.

Ladd Jr died on Wednesday, his daughter Amanda Ladd-Jones, who directed the documentary Laddie: The Man Behind The Movies, wrote in a Facebook post.

No cause of death was given.

Ladd Jr, the son of Shane star Alan Ladd, started in the film business as his father’s stuntman but rose to become one of its leading – and most widely liked – executives.

As studio head at Fox and MGM (twice), Ladd Jr – affectionately known as “Laddie” – was involved in some 14 best picture nominees, including Young Frankenstein (1974), The Rocky Horror Picture Show (1975), Chariots Of Fire (1981) and Blade Runner (1982).

As an independent producer, Ladd Jr helped steer films including Once Upon A Time In America (1984), The Right Stuff (1983), Gone, Baby Gone (2007) and Mel Gibson’s Braveheart (1995), for which he won best picture.

All told, Ladd Jr produced or greenlit movies that won more than 50 Oscars and 150 nominations.

And he did so with an easy-going, tight-lipped manner that made him widely admired by stars and filmmakers.

Esquire magazine put him on the cover in 1978 with the headline: “Triumph Of The Laid-Back Style.”

A former talent agent for stars such as Robert Redford and Judy Garland, Ladd Jr joined 20th Century Fox in 1973, and later became president.

There, he greenlit George Lucas’s 10 million dollar science-fiction film – the original script was titled The Adventures Of Luke Starkiller As Taken From The Journal Of The Whills, Saga 1, Star Wars – when few in Hollywood saw any potential in it.

Lucas once recalled his meeting with Ladd Jr, whose faith in the filmmaker began with an early screening of Lucas’s American Graffiti before it was released.

“The only reason it got off the ground was that Alan liked ‘American Graffiti’ and said, ‘I don’t understand this movie, I don’t get it at all, but I think you’re a talented guy and I want you to make it,'” Lucas said in Tom Shone’s 2004 book Blockbuster.

Even when the studio’s confidence wavered on Star Wars, Ladd Jr kept his trust in what would become one of the highest grossing films ever made.

His only false move may have been granting Lucas’ merchandising rights rather than a raise when American Graffiti became a hit.

“My biggest contribution to ‘Star Wars’ was keeping my mouth shut and standing by the picture,” Ladd Jr told Variety.

Star Wars was not the only classic sci-fi film Ladd Jr greenlit at Fox – he also backed Alien.

But the same year that 1979 film opened, after clashing with Fox chairman Dennis Stanfill, Ladd Jr left to form the independent production company Ladd Co.

On his own, Ladd Jr produced, beside The Right Stuff and Blade Runner, films such as Body Heat and Police Academy.

But Ladd Co, weighed down by some disappointments and hefty budgets for films such as The Right Stuff, struggled to be profitable.

In the mid-1980s, Ladd Jr moved to MGM, which he would eventually lead.

His two stints at the studio were less successful than his time at Fox, but movies he made there included Moonstruck (1987), Rain Man (1988), A Fish Called Wanda (1988) and Thelma & Louise (1991).

When a loan default put MGM in the hands of Credit Lyonnais, the French bank acrimoniously ousted Ladd Jr, who was eventually given 10 million dollars to sever his contract and two projects to take with him.

He chose Braveheart.

When Braveheart won best picture, some saw it as the widely admired Ladd Jr – Richard Donner famously once said “There are snakes in this business and then there’s Alan Ladd” – getting the last laugh.

“I guess it is kind of a sweet justice,” Ladd Jr told the Los Angeles Times in 1996.

“If I were more eloquent, I would have thanked Credit Lyonnais for treating me shabbily and allowing me to take this project with me. In fairness, MGM couldn’t have afforded to make this film at the time. Paramount could.”

Ladd Jr was never known for his loquaciousness, though.

When he, as one of three producers, accepted the Oscar, his entire speech was: “I’d like to thank my family. Thank you.”

Ladd Jr is survived by his wife, Cindra Pincock; children Kelliann, Tracy and Amanda; half-brother, David Ladd; half-sister, Alana Ladd; and stepsister Carol Lee Stuart-Ladd.