What has the author Mark Morris written?

It seems you are thinking of the renowned choreographer Mark Morris, not an author. He is widely celebrated for his dance works, not for his writing.

Mark Morris is a highly acclaimed American choreographer. Some of his famous works include:

* The Hard Nut (1991): A modern interpretation of "The Nutcracker" ballet.

* L'Allegro, il Penseroso ed il Moderato (1988): A work inspired by Handel's music.

* Dido and Aeneas (1989): A contemporary rendition of Henry Purcell's opera.

If you are looking for information on a different Mark Morris, please clarify.