Howard Sherman has an impressive study of plays produced on Broadway over the past 20 years:
Let me begin with the list of playwrights who have had five or more productions on Broadway in the last 20 years, new or revival….
What is immediately noticeable among these 17 playwrights? They’re all male. There is but a single playwright of color. Eight are not American. Six were dead during the 20 years examined. If anyone is looking for hard and fast data about the lack of diversity among the playwrights getting work on Broadway, this would be Exhibit A.