Question: Who is of Lebanese descent, John Barth or Ann-Marie MacDonald?

Context paragraphs:
Goodnight Desdemona (Good Morning Juliet): Goodnight Desdemona (Good Morning Juliet) is a 1988 comedic play by Ann-Marie MacDonald in which Constance Ledbelly, a young English literature professor from Queen's University, goes on a subconscious journey of self-discovery.

Lebanese people in Spain: Lebanese people in Spain (Spanish: "Libaneses en España" ) are people from Lebanon or those of Lebanese descent, who live in the country of Spain.  Most of the Lebanese people in Spain are expatriates from Lebanon but also there is a sizable group of people with Lebanese descent from Latin American countries with sizable Lebanese diasporas like Argentina, Colombia, Ecuador, Venezuela, Mexico, Uruguay, Chile, Paraguay and Brazil.

Once Upon a Time: A Floating Opera: Once Upon a Time: A Floating Opera is a novel by American writer John Barth, published in 1994.  A character named John Barth and his female companion set sail on Chesapeake Bay on the 500th anniversary of Columbus's discovery of America and are unexpectedly caught in a tropical storm.  While trying to find his way out of the Maryland marshes, Barth comes across a "metaphysical zone" in which he encounters scenes and characters from his previous novels.  The title references Barth's first novel, "The Floating Opera" (1956).

John Barth: John Simmons Barth ( ; born May 27, 1930) is an American writer, best known for his postmodernist and metafictional fiction.

Lebanese Haitians: Lebanese Haitians are Haitian of Lebanese descent or a Lebanese with Haitian citizenship.  There are 8,000 people of Lebanese descent living in Haiti.

Lebanese people in Syria: The Lebanese people in Syria are people from Lebanon or those of Lebanese descent who live in the country of Syria.  There are many prominent people in Syria who are of Lebanese descent.

Ann-Marie MacDonald: Ann-Marie MacDonald (born October 29, 1958) is a Canadian playwright, novelist, actress and broadcast host who lives in Toronto, Ontario, Canada.  The daughter of a member of Canada's military, she was born at an air force base near Baden-Baden, West Germany.  She is of Lebanese descent through her mother.

The Arab's Mouth: The Arab's Mouth is a 1990 play by Ann-Marie MacDonald which she later revised to create "Belle Moral", at which point most of the Arabic references were cut.  The title refers to a shape found on a stone by the central character—a circle or zero.  First staged at the Factory Theatre in Toronto, MacDonald lightly revised the play for publication, at which point it was staged at Theatre Kingston in Kingston, Ontario.  It is now out of print, having been superseded by "Belle Moral".

Kassim Basma: Kassim Basma (born in 1960 in Koidu Town, Sierra Leone) is a multimillionaire Sierra Leonean businessman and the second leading diamond exporter from Sierra Leone, accounting for around 38% of all official Sierra Leone diamond exports.  Basma was born in Kono District in Eastern Sierra Leone.  He was born into a family of Lebanese descent from the southern Lebanese village of Ain Baal.  He is a member of the Basma family, one of the oldest families of Lebanese descent in Sierra Leone.

Belle Moral: Belle Moral is a play by Ann-Marie MacDonald which premiered at the Shaw Festival in 2005.

Supporting paragraphs: John Barth Ann-Marie MacDonald
Answer: Ann-Marie MacDonald