Martin Scorsese, Al Pacino and Woody Allen have paid tribute to Sidney Lumet following his death on Saturday at the age of 86.
The late film director rose to prominence with his 1957 drama 12 Angry Men.
His other major credits include Dog Day Afternoon, Serpico and Network.
He directed more than 40 films in total and received some 50 Oscar nominations.
Fellow film maker Woody said he was "constantly amazed" at "how many actor and actress had their best work under his direction."
"Knowing Sydney, he will have more energy dead than most live people," he added.
Martin Scorsese described his passing as "the end of an era."
And actor Al Pacino said it would be difficult to imagine there would be no more films from the New Yorker.
"All the more reason to take good care of the ones he left behind," he said.
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