Equus is a play by Peter Shaffer written in 1973, telling the story of a psychiatrist who attempts to treat a young man who has a pathological religious fascination with horses.
Charles Frohman (July 15, 1856 – May 7, 1915) was an American theatrical producer.
 Frohman was producing plays by 1889 and acquired his first Broadway theatre by 1892.
 He discovered and promoted many stars of the American theatre.
Harold Smith Prince (born January 30, 1928) is an American theatrical producer and director associated with many of the best-known Broadway musical productions of the 20th century.
 He has garnered twenty-one Tony Awards, more than any other individual, including eight for directing, eight for producing the year's Best Musical, two as Best Producer of a Musical, and three special awards.
The Lark (French: 'L'Alouette" ")" "is a 1952 play about Joan of Arc by the French playwright Jean Anouilh.
 It was presented on Broadway in English in 1955, starring Julie Harris as Joan and Boris Karloff as Pierre Cauchon.
 It was produced by Kermit Bloomgarden.
 Lillian Hellman made the English adaptation and Leonard Bernstein composed the incidental music.
 The two stars of the play reprised their roles in a 1957 television production of the play, as part of the anthology series "Hallmark Hall of Fame".
 A different television adaptation aired in 1958 in Australia.
 There is another English translation by Christopher Fry."
Kermit Bloomgarden (December 15, 1904 – September 20, 1976) was an American theatrical producer.
 He was an accountant before he began producing plays on Broadway including "Death of a Salesman" (1949), "The Diary of Anne Frank" (1955), "The Music Man" (1957), "Look Homeward, Angel" (1957), and "Equus" (1973).
Joseph "Joe" Papp (June 22, 1921 – October 31, 1991) was an American theatrical producer and director.
 He established The Public Theater in what had been the Astor Library Building in lower Manhattan.
 There, Papp created a year-round producing home to focus on new plays and musicals.
 Among numerous examples of these were the works of David Rabe, Ntozake Shange's "For Colored Girls Who Have Considered Suicide When the Rainbow Is Enuf", Charles Gordone's "No Place to Be Somebody" (the first off-Broadway play to win the Pulitzer Prize), and Papp's production of Michael Bennett's Pulitzer Prize–winning musical, "A Chorus Line".
 Papp also founded Shakespeare in the Park, helped to develop other off-Broadway theatres and worked to preserve the historic Broadway Theatre District.
Michael Butler (born November 26, 1926 in Chicago, Illinois) is an American theatrical producer best known for bringing the rock musical "Hair" from the Public Theater to Broadway in 1968.
 During his time as "Hair" producer he was dubbed by the press as "the hippie millionaire".
 Other Broadway production credits include the play "Lenny" in 1971 and the musical "Reggae" in 1980.
Equus is a 1977 British-U.S. drama film directed by Sidney Lumet and written by Peter Shaffer, based on his play of the same name.
 The film stars Richard Burton, Peter Firth, Colin Blakely, Joan Plowright, Eileen Atkins, and Jenny Agutter.
 The story concerns a psychiatrist treating a teenager who has blinded horses in a stable, attempting to find the root of his horse worship.
Jed Harris (born Jacob Hirsch Horowitz; February 25, 1900 – November 15, 1979) was an Austrian-born American theatrical producer and director.
 He was responsible for some of the most successful productions on the Broadway stage in the 1920s and 1930s, including "Broadway" (1926), "Coquette" (1927), "The Royal Family" (1927), "The Front Page" (1928), "Uncle Vanya" (1930), "The Green Bay Tree" (1933) and "Our Town" (1938).
 He later directed the original Broadway productions of "The Heiress" (1947) and "The Crucible" (1953).
Command Decision was a 1948 play in three acts written by William Wister Haines, and formed the basis for his best-selling novel of the same title.
 Produced by Kermit Bloomgarden and directed by John O'Shaughnessy, it ran for 409 performances from October 1, 1947 to September 18, 1948 at the Fulton Theatre in New York City.
 Paul Kelly won the Tony Award for Best Actor in a Play that year, while James Whitmore received the Tony Award for Best Newcomer.

Question: Kermit Bloomgarden was an American theatrical producer, he was an accountant before he began producing plays on Broadway including, which play by Peter Shaffer written in 1973, telling the story of a psychiatrist who attempts to treat a young man who has a pathological religious fascination with horses?
Answer: Equus