Jean-Luc Godard smokes as “Masculin, feminin” is being tipped in the 16th annual Berlin Film Festival as an insider for the top movie prize, the Berlin Golden Bear in Berlin, June 27, 1966. AP Photo/Edwin Reichert, File

Jean-Luc Godard, the influential French New Wave writer-director who broke new ground in cinematic expression in the 1960s with films such as “Breathless,” “Contempt” and “Weekend” and became a guiding light to fellow filmmakers throughout his more than six-decade career, has died. He was 91.

Multiple French media outlets reported that they had learned the news of Godard’s death from the filmmaker’s relatives Tuesday. The French news outlet Liberation, citing an unnamed family member, said Godard died by assisted suicide, which is legal in Switzerland. “He was not sick,” the family member was quoted as saying, “he was simply exhausted.”

French President Emmanuel Macron hailed Godard as a “national treasure” who had “invented a resolutely modern, intensely free art” with his pioneering works.

Forever content to forgo commercial success in exchange for artistic freedom, Godard was the most inventive and radical of the directors of the French New Wave, which upended European cinema in the 1950s and ’60s, reflecting their personal visions and challenging traditional filmmaking conventions.

Like fellow New Wave directors Francois Truffaut, Eric Rohmer, Jacques Rivette and Claude Chabrol, the movie-obsessed Godard came to filmmaking after being a critic. He was among the earliest contributors to the influential French film magazine Cahiers du Cinema, the birthplace of the auteur theory, which asserts that the director can be the “author” of a film, in the same way a writer is the author of a novel.

“Godard was one of the inventors of the auteur theory and perhaps the most rigorous of the New Wave filmmakers in putting that idea into practice,” film critic David Sterritt told the Los Angeles Times in 2006.

Director Jean-Luc Godard and actress Anna Karina are shown at the International Film Festival in Venice in 1965. AP Photo/Mario Torrisi

“Every one of his films and videos is intensely personal to him and represents his own utterly unique views of the world and the people in it,” Sterritt said.

Godard already had directed several short films when, at 29, he captured international attention in 1960 with his first feature film, “Breathless,” a boldly innovative homage to American gangster B-movies.

Shot on location in Paris, the low-budget romantic crime-drama starred Jean-Paul Belmondo as an amoral young thug with a Humphrey Bogart fixation who is on the run after stealing a car and killing a cop. His love interest is an American girl, played by Jean Seberg, who winds up betraying him.

“Breathless” became famous for its rule-breaking use of hand-held cameras that circled the action, natural lighting, direct sound recording, jump-cut editing and sense of spontaneity — as well as for its unabashed references to Hollywood films.

“Modern movies begin here,” the late Chicago Sun-Times movie critic Roger Ebert wrote of “Breathless” in 2003. “No debut film since ‘Citizen Kane’ in 1942 has been as influential.”

During the 1960s alone, Godard directed nearly 30 shorts and features, including “Le Petit Soldat,” “A Woman Is a Woman,” “My Life to Live,” “Les Carabiniers,” “Band of Outsiders,” “A Married Woman,” “Alphaville,” “Masculine Feminine,” “Pierrot Le Fou,” “2 or 3 Things I Know About Her” and “Weekend,” which famously features a tragicomic seven-minute tracking shot of a traffic jam created by a horrific crash.

By the late ‘60s, Godard had embarked on what Sterritt called his “ultra-radical political phase” as a filmmaker.

As Julia Lesage wrote in her 1979 bibliography, “Jean-Luc Godard: A Guide to References and Resources”: “Godard seemed to be searching both for the best way to make a political film and the best way to integrate his metier, filmmaking, with militant Marxist-Leninist political activity.”

By the late 1970s, Sterritt said, Godard had returned to filmmaking geared slightly more to a theatrical audience, although the films remained artistically radical.

“The important thing about Godard is he broke all the rules, and he showed that everything could be cinematic if your conceptualization — your ideas — were bold enough,” Marsha Kinder, a professor of critical studies at the USC School of Cinematic Arts, told the L.A. Times in 2006.

“No matter how apocalyptic or bleak his vision might be, his films made me feel hopeful because his brilliance and inventiveness were so dazzling,” Kinder said. “He just redefined what kind of pleasures cinema could give you.”

But for audiences, Kinder acknowledged, the rule-breaking Godard “could also be very exasperating.”

Indeed, Godard was well known for challenging his audiences.

“I don’t really like telling a story,” he once said. “I prefer to use a kind of tapestry, a background on which I can embroider my own ideas.”

And beginning with ideas, Godard said in a 1995 interview with the L.A. Times, “doesn’t help with the audience. But I still prefer a good audience. I’d rather feed 100% of 10 people. Hollywood would rather feed 1% of 1 million people. Commercially speaking, my way is not better.”

Godard’s films influenced countless filmmakers, including Martin Scorsese. While watching Godard’s movies as a film student in the ‘60s, Scorsese said he was taken with the “sense of freedom, of being able to do anything — there was a kind of joy that burst into me when I saw the movies.”

Another well-known fan, director Quentin Tarantino, named his production company A Band Apart after the French title (“Bande a Part”) for Godard’s 1964 film “Band of Outsiders” and heeded one of Godard’s maxims when he filmed “Pulp Fiction”: “A movie should have a beginning, a middle and an end, though not necessarily in that order.”

The late director Bernardo Bertolucci put it simply: “We all wanted to be Jean-Luc Godard.”

“There is no one like him in the whole history of cinema,” said Kinder. “He took his vengeance against Hollywood. He never stopped really attacking the dominance of Hollywood cinema, and he never stopped expanding the language and subversive possibilities of cinema.

“This makes him, I think, one of the greatest filmmakers in the history of world cinema. He made everything possible.”

One of four children, Godard was born in Paris on Dec. 3, 1930. His mother was the daughter of a wealthy Parisian banker and his father was a Swiss physician, who divided his work between Paris and Switzerland.

In 1933, Godard’s family moved permanently to Switzerland after his father landed a position at a clinic near the village of Gland. Five years later, they moved to Nyon, Switzerland, where they lived during World War II.

After the war, the 15-year-old Godard moved to Paris to study at the prestigious Lycee Buffon, a school that focused on the physical and biological sciences. He returned to Switzerland to attend a college in Lausanne in 1948, but a year later he was back in Paris, where he registered at the Sorbonne for a certificate in anthropology.

By then, however, Godard was so taken with cinema that he paid scant attention to his studies.

He said he had been a casual filmgoer until he began attending a Left Bank film club run by critic Andre Bazin, where he met future New Wave directors Truffaut, Rohmer and Rivette. He and his friends also regularly frequented Cinematheque Francaise.

“We systematically saw everything there was to see,” he told Jean Collet, author of the 1970 book “Jean-Luc Godard.”

In 1950, Godard, Rohmer and Rivette co-founded the short-lived La Gazette du Cinema, which published their film criticism; it lasted only five issues. After Bazin co-founded Cahiers du Cinema in 1951, Godard started publishing essays there. He also began to learn filmmaking by acting in his friends’ short films.

For several years Godard was also a petty thief, who stole repeatedly to support himself and was frequently caught, according to Colin MacCabe’s 2003 book, “Godard: A Portrait of the Artist at Seventy.”

Godard, MacCabe wrote, claimed to have financed Rivette’s first short film by stealing from an uncle. And in the early ‘50s, after working for a company constructing dams in the Swiss Alps, Godard spent three days in jail after stealing from the Swiss television service he was then working for in Zurich.

After Godard was released from jail, his father convinced him to go to a Swiss mental clinic that specialized in psychotherapy.

After several months in the clinic, Godard returned to the construction company in the Alps, where he shot his first film, a 20-minute documentary on the construction of the dam, “Operation Beton.” He then directed a 10-minute comedy short in Geneva before moving back to Paris.

In 1961, Godard married Anna Karina, who starred in “A Woman Is a Woman,” “My Life to Live,” “Band of Outsiders” and other Godard films during the ‘60s. His marriage to Karina ended in divorce — as did his marriage to Anne Wiazemsky, who starred in several of his films, including 1967’s “La Chinoise.” Godard later began a longtime relationship with his collaborator, Anne-Marie Mieville. The two moved to Switzerland in the ‘70s.

In recent decades, Godard worked in both film and video. And, Sterritt said, “what some consider his magnum opus, the crowning achievement of his career,” is Godard’s “Histoire(s) du Cinema,” a multi-segment video work launched in 1989. His later films included “Goodbye to Language,” a fragmented film in 3D about a young couple who communicate through their pet dog.

Late in life, Godard seemed pleased but baffled that critics were still examining his work. He conceded, however, that the audience for his films had grown small.

“I never understand why I’m remembered,” he once told the L.A. Times. “I always wonder why I’m still known because nobody sees my movies now. Well, almost nobody.”