where did the doctor get his mobile emitter
The Doctor (Star Trek: Voyager) The Doctor later acquired a mobile holographic emitter from the 29th century.[4] Although he had previously been confined to Sickbay or the Holodeck, the mobile emitter allowed The Doctor to move about freely, making him ideal for missions where the environment would be harmful or otherwise fatal to the crew. In one notable incident, when an away team was trapped on a radioactive planet, The Doctor was able to infiltrate the people and almost single-handedly rescue the team because, as he pointed out, being a hologram renders him immune to the radiation, stating that "being a hologram does have its advantages."
The Doctor (Star Trek: Voyager) A recurring theme in the Doctor’s life was his lack of a proper name. Starfleet did not assign a name and initially the Doctor maintained that he did not want one. In season 1 episode 6, “Eye of the Needle,” the Doctor requests a name immediately before credits roll. Later, he adopted such names as 'Schweitzer'[5] (after Albert Schweitzer), ‘Shmullus’[6] (by Vidiian patient Dr. Denara Pel), ‘Van Gogh,’ ‘Kenneth,”[1] ‘Jones’ and several others. His friends suggest the famous historical Earth doctors "Galen" and "Spock." The captioned dialog of early episodes, and early promotional material for the series premiere, referred to him as ‘Dr. Zimmerman,’ after his creator Lewis Zimmerman. In the series finale, an alternate future timeline is shown where he has chosen the name Joe after his new wife’s grandfather (and having Tom Paris jest, "It took you 33 years to come up with 'Joe'?" in response).[7]