A master dealmaker, he had as clients Madonna, Michael Jackson, Tom Cruise, the Beatles and many others, becoming something of a celebrity himself.

Fields included Madonna, Tom Cruise, Warren Beatty, the Beatles, Michael Jackson, Dustin Hoffman, George Lucas, Steven Spielberg, Michael Ovitz, and Jeffrey Katzenberg.

Among his most famous cases was his fierce representation of Jeffrey Katzenberg, the chief executive of DreamWorks Animation, against the Walt Disney Company, for denying Mr.

Katzenberg contractual bonuses of $250 million for such hits as “The Lion King” and “The Little Mermaid” when he was that studio’s chairman, from 1984 to 1994.

Fields conducted a withering cross-examination of Michael Eisner, then the Disney chief, revealing that Mr.

The impression left by the exchange discomfited the Disney company, which had built its reputation on lovable dwarfs, among other animated characters, and on the kindly and paternal studio heads it presented on television.

It settled the lawsuit for the full $250 million, more than triple the amount ever given to an individual in a Hollywood lawsuit, according to Variety.

When the producer Harvey Weinstein and his brother, Bob, wanted to split off their Miramax production company from Disney, a trial seemed inevitable.

Fields, aware of Disney’s wariness of him, worked out a deal in which Disney got to keep the Miramax name and its library of 550 films; in return, it had to give the Weinsteins $130 million to start a new film company.

“In the entertainment business walking into litigation without Bert Fields is like walking into the Arctic without a jacket,” Harvey Weinstein, who is now in prison for sex crimes, once told The New York Times.

Fields represented Michael Jackson in a civil case growing out of accusations in 1993 that he had molested an underage boy, a case that was settled for over $20 million but in which Jackson admitted no wrongdoing.

Fields’s wile was apparent when the author Barbara Chase-Riboud filed a $10 million lawsuit against DreamWorks accusing it of using material from her historical novel for its 1997 film “Amistad,” directed by Steven Spielberg, about a slave ship revolt.

Fields cultivated the impression that he had never lost a case, yet all but a handful of lawsuits were settled out of court and not always as lucratively as his clients had expected.

Madonna’s 2004 breach-of-contract lawsuit against Warner Music was settled for $10 million, not the $200 million she had sought.

Bertram Harris Fields was born on March 31, 1929, in Los Angeles.

Maxwell Fields, was an eye surgeon whose patients included Groucho Marx and Mae West.

Guggenheim, an art consultant and his third wife, when he defended her against a lawsuit by Sylvester Stallone involving a painting she acquired for him.

Robinson, Peter Falk and Elaine May — and formed a profitable friendship with the superagent Michael Ovitz, who referred to him more luminous names, like Dustin Hoffman.

Fields prided himself on his interests outside the law.