Paul Thompson O.C. (born May 4, 1940 in Charlottetown, Prince Edward Island) is a Canadian playwright and theatre director.
 Best known for his term as artistic director of Theatre Passe Muraille in Toronto, Ontario from 1970 to 1982, Thompson was known for pioneering techniques of collective creation, in which actors, playwrights and directors would collaborate on the creation of a play through field research and acting improvisations.
 Plays on which Thompson was credited as a primary or collaborating writer during this era included "Doukhobors" (1970), "The Farm Show" (1972), "1837: The Farmers' Revolt" (1973, with Rick Salutin), "I Love You, Baby Blue" (1975), "Far As the Eye Can See" (1977, with Rudy Wiebe) and "Maggie and Pierre" (1980, with Linda Griffiths).
David Hein is a Canadian playwright, songwriter and actor best known for co-writing the Broadway musical "Come from Away" with his writing partner and wife, Irene Sankoff.
Come From Away is a musical with book, music and lyrics by Irene Sankoff and David Hein.
 It is set in the week following the September 11 attacks and tells the true story of what transpired when 38 planes were ordered to land unexpectedly in the small town of Gander, Newfoundland, as part of Operation Yellow Ribbon.
 The characters in the musical are based on (and in most cases share the names of) real Gander residents as well as some of the 7,000 stranded travelers they housed and fed.
David William Fennario, (born David Wiper, 26 April 1947) is a Canadian playwright best known for "Balconville" (1979), his bilingual dramatization of life in working-class Montreal, for which he won the Floyd S. Chalmers Canadian Play Award.
 A committed Marxist, Fennario was a candidate for the Union des forces progressistes in 2003 and for Québec solidaire in 2007.
 He has been the subject of two National Film Board of Canada documentaries, "David Fennario's Banana Boots" and "Fennario: His World On Stage."
Hannah Moscovitch (born June 5, 1978) is a Canadian playwright who rose to national prominence in the 2000s.
 She has been dubbed “an indie sensation” by Toronto Life Magazine; “the wunderkind of Canadian theatre” by CBC Radio; “irritatingly talented” by the now defunct Eye Weekly; and the “dark angel of Toronto theatre” by Toronto Star.
 The National Post, The Globe and Mail, and Now Magazine have all hailed Hannah as “Canada’s Hottest Young Playwright”.
 She is best known for her plays "East of Berlin", "The Russian Play," and "This Is War".
Florence Gibson MacDonald is a Canadian playwright.
 She is best known for her plays "Belle", which was a finalist for the Dora Mavor Moore Award for Outstanding New Play in 2000 and a winner of the Floyd S. Chalmers Canadian Play Award in 2001, and "Home Is My Road", which won the Carol Bolt Award in 2004.
Leslie Arden is a Canadian musical theatre composer, lyricist and librettist.
 She is best known for her work "The House of Martin Guerre" (co-book by Anna Theresa Cascio) produced by Theatre Plus (1993), the Goodman Theatre (1996) in Chicago and the Canadian Stage Company (1997).
 Her musical "The Boys are Coming Home" was part of the American Music Theatre Project at North Western University and was showcased by the National Alliance of Musical Theatre in New York City.
 Theatre critic Richard Ouzanian says she is "the creator of some of the most sophisticated work on our stages".
 The Toronto Star has commented that her work is “beautifully crafted” and USA Today states she is a “major talent”.
 She also wrote the Chalmers Award-winning "The Happy Prince".
 She collaborated with esteemed Canadian playwright Norm Foster for her latest musical "Ned Durango".
 It had its world premiere at Theatre Orangeville in May 2011.
Michael John Hollingsworth (born February 5, 1950) is a Canadian playwright, theatre director and experimental multimedia artist.
 He is best known for "The History of the Village of the Small Huts", a series of 21 historical plays dramatizing and satirizing Canadian history.
Raymond Hull (1919–1985) was a Canadian playwright, television screenwriter, and lecturer.
 He also wrote many non-fiction books, numerous magazine articles, short stories, and poetry.
 He is best known as the co-author of the book The Peter Principle with Laurence J. Peter.
 He is also known for the saying "He who trims himself to suit everyone will soon whittle himself away."
The Ends of the Earth is a 1992 play by Canadian playwright Morris Panych.
 It tells the story of two men, Frank and Walker, each of whom is convinced that the other is following him.
 Despite their best efforts at running away from each other, the two men repeatedly find themselves in the same places.

Question: This Canadian playwright is best known for co-writing a musical set in the weeks following what?
Answer: September 11 attacks