 The Doctors name was originally going to be "Dr. Zimmerman" (after  longtime Star Trek production designer Herman F. Zimmerman (qv)),  but this was dropped. Several early episodes, however, identify the  character as Zimmerman in the closed captions. It was later  established that Zimmerman was the name of The Doctors programmer,  and the character appeared in episodes of Voyager and  _"Star Trek: Deep Space Nine" (1993)_ (qv). The real last name of  actress Jeri Ryan (qv) also happens to be Zimmerman.