NEW YORK (AP) — Playwright Neil Simon, a master of comedy whose laugh-filled hits such as "The Odd Couple," ''Barefoot in the Park" and his "Brighton Beach" trilogy dominated Broadway for decades, has died. He was 91.

Simon died early Sunday of complications from pneumonia at New York Presbyterian Hospital in Manhattan, said Bill Evans, a longtime friend and spokesman for Shubert Organization theaters.

In the second half of the 20th century, Simon was the American theater's most successful and prolific playwright, often chronicling middle class issues and fears. Starting with "Come Blow Your Horn" in 1961 and continuing into the next century, he rarely stopped working on a new play or musical. His list of credits is staggering.

The theater world quickly mourned his death , including Tony Award-winning actor and playwright Harvey Fierstein, who tweeted that Simon "could write a joke that would make you laugh, define the character, the situation, and even the world's problems."

Matthew Broderick, who in 1983 made his Broadway debut in Simon's "Brighton Beach Memoirs" and his movie debut in Simon's "Max Dugan Returns," added: "I owe him a career. The theater has lost a brilliantly funny, unthinkably wonderful writer. And even after all this time, I feel I have lost a mentor, a father figure, a deep influence in my life and work."

For seven months in 1967, he had four productions running at the same time on Broadway: "Barefoot in the Park," ''The Odd Couple," ''Sweet Charity," and "The Star-Spangled Girl."

Even before he launched his theater career, he made history as one of the famed stable of writers for comedian Sid Caesar that also included Woody Allen, Mel Brooks and Carl Reiner.

Simon was the recipient of four Tony Awards, the Pulitzer Prize, the Kennedy Center honors (1995), four Writers Guild of America Awards and an American Comedy Awards Lifetime Achievement honor. In 1983, he had a Broadway theater named after him when the Alvin was rechristened the Neil Simon Theatre.

In 2006, he won the Mark Twain Prize for American Humor, which honors work that draws from the American experience. The previous year had seen a popular revival of "The Odd Couple," reuniting Nathan Lane and Matthew Broderick after their enormous success in "The Producers" several years earlier.

In a 1997 interview with The Washington Post, Simon reflected on his success: "I know that I have reached the pinnacle of rewards. There's no more money anyone can pay me that I need. There are no awards they can give me that I haven't won. I have no reason to write another play except that I am alive and I like to do it," he said.

Simon had a rare stumble in the fall of 2009, when a Broadway revival of his "Brighton Beach Memoirs" closed abruptly after only nine performances because of poor ticket sales. It was to have run in repertory with Simon's "Broadway Bound," which was also canceled.

The bespectacled, mild-looking Simon (described in a New York Times magazine profile as looking like an accountant or librarian who dressed "just this side of drab") was a relentless writer — and rewriter.

"I am most alive and most fulfilled sitting alone in a room, hoping that those words forming on the paper in the Smith-Corona will be the first perfect play ever written in a single draft," Simon wrote in the introduction to one of the many anthologies of his plays.

He was a meticulous joke smith, peppering his plays, especially the early ones, with comic one-liners and humorous situations that critics said sometimes came at the expense of character and believability. No matter. For much of his career, audiences embraced his work, which often focused on middle-class, urban life, many of the plots drawn from his own personal experience.

"I don't write social and political plays because I've always thought the family was the microcosm of what goes on in the world," he told The Paris Review in 1992.

Simon received his first Tony Award in 1965 as best author — a category now discontinued — for "The Odd Couple," although the comedy lost the best-play prize to Frank D. Gilroy's "The Subject Was Roses." He won a best-play Tony 20 years later for "Biloxi Blues." In 1991, "Lost in Yonkers" received both the Tony and the Pulitzer Prize. And there was a special achievement Tony, too, in 1975.