Here’s my interview with Susan Jones, a ballet mistress at American Ballet Theatre in charge of the corps de ballet. Jones joined ABT in 1970 and stayed for nine years. In that time, she danced every corps role in the rep, plus Lizzie in Fall River Legend, Cowgirl in Rodeo, and a few other choice parts that suited her dramatic side. She quickly showed a skill for remembering steps, which became handy when working with Twyla Tharp on Push Comes to Shove. Baryshnikov made her a ballet mistress, and she never left. This fall, she is re-staging Tharp’s Bach Partita, which hasn’t been done for almost thirty years.