Stephen was taught by broadway legend, Oscar Hammerstein II.
He actually provided the voice of Rose's father on the original cast album to the musical Gypsy in 1962.
He shares his birthday with fellow musical composer Andrew Lloyd Webber.
Stephen tried out as a contestant for the game showThe $64,000 Question in 1955 but didn't make it.
He graduated from Williams College in 1952.
He has been writing for the American Musical Theatre for the past 40 years.
In 1983, Stephen was elected to the American Academy of Arts and Letters.
In 1993, Stephen was a recipient of the prestigious Kennedy Center Honors.
In 1990, Stephen was appointed the first Visiting Professor of Contemporary Theatre at Oxford University.
In the summer of 2002, six of his shows were presented in Washington, DC as part of The Kennedy Center's Sondheim Celebration.
In 1997, he received the National Medal of Arts Award.
Stephen used to get around Manhattan by riding a bicycle.
In 1973, he made his professional acting debut in a televised production of Kaufman's June Moon.
In 1960, he purchased a Baldwin grand piano from songwriter Leonard Bernstein for only $5400.
Oscar winning actress Katharine Hepburn used to be his next door neighbor and complained about his late night piano playing.
He wrote 11 scripts for the television series Topper, when he lived in Hollywood.
Stephen's favorite drink is Scotch.
In 1979, he suffered a heart attack.
Stephen is an inductee in the Songwriters Hall of Fame.
In 1985, he won the Pulitzer Prize for Drama for Sunday in the Park with George along with James Lapine.
Stephen attended high school at the George School in Newton, PA.
Stephen: My idea of heaven is not writing.
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