Feldstein died on Tuesday at his home in Montana, according to the Franzen-Davis Funeral Home and Crematory. No cause of death was released.
In 1956, publisher William M Gaines put Feldstein in charge of the magazine, which gleefully parodied politicians and mocked traditional morality.
Building on a character used by Mad founding editor Harvey Kurtzman, Feldstein turned the freckle-faced Alfred E Neuman into an underground hero a dimwitted everyman with a gap-toothed smile and the recurring stock phrase, "What, Me Worry?"
Feldstein and Gaines assembled a pool of artists and writers who turned out such enduring features as "Spy vs Spy," ''The Lighter Side of..." and "Snappy Answers to Stupid Questions."
Also Read
"The Portable Mad," a compilation of magazine highlights edited by Feldstein in 1964, gives a picture of the typical Mad features that year. Among its offerings: "Some Mad Devices for Safer Smoking" (including a "nasal exhaust fan" and "disposable lung-liner tips"); "The Mad Academy Awards for Parents" (one nominee does her "And THIS is the thanks I get!" routine); "The Lighter Side of Summer Romances"; and "Mad's Teenage Idol Promoter of the Year" (which skewers Elvis Presley and the Beatles.)
But not everyone was amused.
Mad once held a spoof contest inviting readers to submit their names to legendary FBI Director J Edgar Hoover for an "Official Draft Dodger Card." Feldstein said two bureau agents soon showed up at the magazine's offices to demand an apology for "sullying" Hoover's reputation by using his name in Mad.
The magazine also attracted critics in Congress who questioned the magazine's decency, and a USD 25 million lawsuit from songwriters who objected to their work being parodied.