- His most famous play, "The Scarecrow", was made into an American opera in 1945 by Normand and Dorothy Lockwood.
- Playwright and poet. Son of Steele MacKaye.
- His play, "The Scarecrow", recently (October 2005) completed a four-week run in New York; its first staging there in more than thirty years.
- Brother of Benton Mackaye, who built the original Appalachian Trail.
- Henry B. Harris, producer of the original Broadway production of Mackaye's most famous play, "The Scarecrow", was one of the passengers on the Titanic who did not survive.
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