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The attack followed a series of anonymous threats to Mr. Filin, 42, a dancer who rose through the ranks of the world's largest ballet company to become its head.

Investigators have not ruled out a dispute over money or property, but are focusing on the theory that Mr. Filin was targeted because of his work, a police spokesman told the Interfax news service.

As dancers kept an overnight vigil at the burn unit where he is being treated, his colleagues said they suspected professional jealousy was behind the attack. In recent weeks, his tires were punctured and his car scratched, and his cellphones and personal e-mail account were hacked and correspondence published, his associates have said. A relative offered to supply Mr. Filin with a bodyguard, but Mr. Filin refused because he did not believe the threats would lead to physical violence, said Dilyara Timergazina, his assistant and adviser.

The threats, she said, "don't show that someone with great conceptual thinking is behind that, but someone very primitive, with unhealthy aspirations – I don't know how to put it – someone full of hate."

Katerina Novikova, the Bolshoi's press spokeswoman, said that Mr. Filin was opening the gate to his residence when a masked man called out his name and threw the contents of a bottle in his face. After the attack he was able to see out of one eye but not the other, Ms. Timergazina said.

An official at the theater told the Interfax news agency that he would be sent overseas, probably to Germany or Israel, for treatment. Doctors have said his recovery may take as long as six months.

The Bolshoi has a reputation for intrigue and outsized emotions, but Ms. Novikova, the theater's press secretary, said she never imagined it could lead to violence.

"Sergei was constantly receiving threats after he took up this post and his predecessors were under attack before him," she told Russia's Channel One. "We never thought that this war for roles – and not for real estate or for oil – could reach such a criminal level. And we always wanted to believe that people connected with theater would have a minimal level of morality. That's why this is an absolutely frightening story."

Mr. Filin signed a five-year contract as director of the Bolshoi in 2011. Among his first big decisions was to hire David Hallberg as a principal dancer – the first American to hold that coveted status, which has traditionally gone to Russian-trained dancers. He suffered a setback when two of its stars, Natalia Osipova and Ivan Vasiliev, left the Bolshoi for a far lesser-known theater in St. Petersburg.

Mr. Filin's leadership has not stood out as especially controversial. But Anastasia Volochkova, a former Bolshoi ballerina, said his power to assign roles made him the focus of sometimes passionate resentment.

"Sergei didn't do anything he could be condemned for," she said, in an interview with Ekho Moskvy, a radio station. "This position is, of course, a sweet one. The head of the ballet decides everything: what grants each artists receive, or maybe won't receive. Who will dance certain roles, and who won't dance them."

She added, "The cruelty of the ballet world has become surprisingly pathological.

One simmering conflict has involved Nikolai Tsiskaridze, a popular principal dancer who last year harshly criticized a recent reconstruction of the theater and has publicly clashed with its leadership since then. A group of Mr. Tsiskaridze's supporters petitioned President Vladimir V. Putin in November, requesting that Mr. Tsiskaridze be appointed director of the Bolshoi.

Aleksei Ratmansky, Mr. Filin's predecessor as the company's artistic director, wrote on Facebook that the incident was "not a coincidence" and wished Mr. Filin "swift recovery and courage."