The co-founder of New York's Circle in the Square Theatre passed away of complications from pneumonia.
Mann directed more than 200 stage productions, including Vanessa Redgrave's Broadway debut in The Lady from the Sea and Salome starring Al Pacino.
In 1951, he started up the Circle in the Square Theatre School, a non-profit acting and music training centre which counts Philip Seymour Hoffman, Kevin Bacon, Dustin Hoffman, Lady Gaga and Benicio Del Toro as former pupils.
He scored his first Tony in 1957 for Long Day's Journey into Night and accepted a special Tony in 1976 for his work with Circle in the Square.
The Broadway League's Executive Director Charlotte St. Martin says, "His contributions to Broadway and off-Broadway are immeasurable, both in the productions he created and the talent that he nurtured. He will be missed by many in our community, and our hearts go out to his friends, family, and students."
The actor has dazzled star-studded crowds this summer (10) at Central Park's Delacorte Theater in Manhattan, where he played villain Shylock in the William Shakespeare play, and bosses at The Public Theater are so impressed by his eight-week run, which ends on Sunday (01Aug10), they have struck a deal with Pacino to relocate the show this autumn (10).
Pacino will reprise his role on 19 October (10) for a limited run at the Broadhurst Theatre.
No further casting announcements were made as WENN went to press.
Pacino previously played Shylock in a 2004 film adaptation of The Merchant of Venice.
On Broadway, he has won Tony Awards for his performances in Does a Tiger Wear a Necktie? and The Basic Training of Pavlo Hummel. He also appeared in Camino Real, Richard III, American Buffalo, Chinese Coffee, two productions of Salome and Hughie, which he also directed.