“Two key staff members left the struggling Pittsburgh Ballet Theatre this week, further fueling concerns about the company’s viability as its leaders try to eliminate a $1 million debt and attract new audiences. The departing veterans include Mary Ellen Miller, who has led fund raising at PBT since 1992, and Molly Mercurio, public relations director. Ballet school director Roberto Munoz has announced that he will leave at the end of the summer, as will Gail Murphy, director of marketing. PBT, which lost its managing director a year ago this month when Steven Libman resigned, is being run by Robert Petrilli, interim managing director, and Terrence Orr, artistic director. Earlier this year, the company suspended its search for a permanent managing director.”