Eugene Gladstone O'Neill (October 16, 1888 – November 27, 1953) was an American playwright and Nobel laureate in Literature.
 His poetically titled plays were among the first to introduce into American drama techniques of realism earlier associated with Russian playwright Anton Chekhov, Norwegian playwright Henrik Ibsen, and Swedish playwright August Strindberg.
 The drama "Long Day's Journey into Night" is often numbered on the short list of the finest American plays in the 20th century, alongside Tennessee Williams's "A Streetcar Named Desire" and Arthur Miller's "Death of a Salesman".
Katharine Elizabeth Dopp ("first name sometimes misspelt as" "Katherine", "and signed her books of fiction as" "Katharine E. Dopp") (b. 1 March 1863 in Portage County, Wisconsin - d. 14 March 1944 in Chicago, Illinois) was one of the foremost American educators at the turn of the 20th century, and one of the first to advocate the involvement of business in education.
 She wrote a series of textbooks on anthropology and economics which were widely used in the public schools of Wisconsin, Illinois and Utah, as well as nationally circulated studies on the same subjects, and children's books.
Brian Patrick Friel (9 January 1929 – 2 October 2015) was an Irish dramatist, short story writer and founder of the Field Day Theatre Company.
 He had been considered one of the greatest living English-language dramatists.
 He has been likened to an "Irish Chekhov" and described as "the universally accented voice of Ireland".
 His plays have been compared favourably to those of contemporaries such as Samuel Beckett, Arthur Miller, Harold Pinter and Tennessee Williams.
Kostas Triantafyllopoulos (also written as Kostas Triantafillopoulos) (Greek: Κώστας Τριανταφυλλόπουλος ) (born 8 February 1956 in Athinaio, Arcadia, Greece) is a Greek actor.
 He graduated from Theodosiadis's Drama School of Athens in 1977 and he has played a wide variety of roles on stage from Greek tragedy, Aristophanes and Shakespeare to contemporary American drama (Eugene O'Neill, Arthur Miller, Tennessee Williams, Joyce Carol Oates, Thornton Wilder, Sam Shepard).
 He's acted in many plays produced by the National Theatre of Greece and by other major Greek theaters.
 He's also starred in numerous television series and films.
 From November 1998 to July 1999 and from July 2002 to March 2003 he participated in the world grand tours of the National Theatre of Greece with the tragedies "Medea" by Euripides (Creon), "Electra" (Paedagogus) and "Antigone" (Guard) both by Sophocles.
 The tour included performances in France, Australia, Israel, Portugal, United States, Canada, Brasil, Germany, Italy, Cyprus, Denmark, Turkey, Bulgaria, China and Japan.
Anita Shreve (born 1946) is an American writer.
 The daughter of an airline pilot and a homemaker, she graduated from Dedham High School in Massachusetts, attended Tufts University and began writing while working as a high school teacher in Reading, Massachusetts.
 One of her first published stories, "Past the Island, Drifting", (published in 1975) was awarded an O. Henry Prize in 1976.
Hans Sahl (born Hans Salomon in Dresden on 20 May 1902; died in Tübingen on 27 April 1993) was a poet, critic, and novelist who began during the Weimar Republic.
 He came from an affluent Jewish background, but like many such German Jews he fled Germany due to the Nazis.
 First to Czechoslovakia in 1933, then to Switzerland, and then France.
 In France he was interned along with Walter Benjamin.
 He would later flee Marseille and work with Varian Fry to help other artists or intellectuals fleeing Nazism.
 He became known as one of the anti-fascist exiles and in the US translated Arthur Miller, Thornton Wilder, and Tennessee Williams into German.
Gerardo Guerrieri (4 February 1920 in Matera - 24 April 1986 in Rome) was an Italian film director, playwright, screenwriter, translator, theater critic, and essayist.
 He is particularly remembered for translating numerous plays into the Italian language, including works by Anton Chekhov, Arthur Miller, Tennessee Williams, August Strindberg, Eugene O'Neill, William Saroyan and William Shakespeare among others.
 His own works were avant-garde in design.
 He was notably the librettist for Renzo Rossellini's 1961 opera "Uno sguardo dal ponte".
Katharine Hepburn (May 12, 1907 – June 29, 2003) was a major American actress of the 20th century who appeared in 44 feature films, eight television movies and 33 plays for over 66 years.
 Hepburn began her career in theatre in the late 1920s, and later appeared on the stage in every decade up until the 1980s.
 Productions Hepburn played in ranged from Shakespeare, to Philip Barry comedies, work by George Bernard Shaw, and a musical.
 Hepburn made her film debut in "A Bill of Divorcement" in 1932.
 Over the next six decades, she appeared in a range of genres, including screwball comedies, period dramas, and adaptations of works by notable playwrights Tennessee Williams, Eugene O'Neill, and Edward Albee.
 Her final appearance in a theatrically released film was a supporting role in "Love Affair" in 1994.
 Hepburn first appeared in a television movie in 1973, and later continued to appear in the medium until she gave the final performance of her career in "One Christmas" in 1994.
 Hepburn also presented two documentaries for television, and narrated two short documentaries.
Thomas Lanier "Tennessee" Williams III (March 26, 1911 – February 25, 1983) was an American playwright.
 Along with Eugene O'Neill and Arthur Miller, he is considered among the three foremost playwrights of 20th-century American drama.
Clifford Odets (July 18, 1906 – August 14, 1963) was an American playwright, screenwriter, and director.
 Odets was widely seen as successor to Nobel Prize-winning playwright Eugene O'Neill as O'Neill began to retire from Broadway's commercial pressures and increasing critical backlash in the mid-1930s.
 From early 1935 on, Odets' socially relevant dramas proved extremely influential, particularly for the remainder of the Great Depression.
 Odets' works inspired the next several generations of playwrights, including Arthur Miller, Paddy Chayefsky, Neil Simon, David Mamet, and Jon Robin Baitz.
 After the production of his play "Clash by Night" in the 1941–1942 season, Odets focused his energies on film projects, remaining in Hollywood for the next seven years.
 He began to be eclipsed by such playwrights as Miller, Tennessee Williams and, in 1950, William Inge.

Question: Who is known, with Eugene O'Neill and Arthur Miller, as one of the three foremost American dramatists of the 20th century, Tennessee Williams or Anita Shreve?
Answer: "Tennessee" Williams