Loretta Shepard was still a teenager when she started using an alias and talking to strangers in the middle of the night. It was 1953 and Shepard, who called herself Joyce, worked past midnight in an undisclosed studio, operating what was, for its time, state-of-the-art technology. “We were told to give no information of ourselves, so we had to work under a different name,” recalls Shepard, who chose to go by her middle name. “I remember they were real strict about having someone know where you were at all times….