Joan Acocella is a staff writer for The New Yorker
. She is the author of Mark Morris, Creating Hysteria: Women and Multiple Personality Disorder
, and Willa Cather and the Politics of Criticism
. She also edited the recent, unexpurgated Diary of Vaslav Nijinsky
. Her article in the May 23, 2013 issue is adapted from her introduction to a new edition of Isadora Duncan’s My Life
, published in May 2013 by Liveright.