In 2377, Dr. Zimmerman was terminally ill and only expected to live a few more months.
In preparation, he began dictating his last will and testament, leaving his entire collection of holographic art, including the 21st century masterpiece "Woman in Four Dimensions", to Reginald Barclay
, as well as his holographic research about miniature holograms for espionage purposes.
In an attempt to find a cure, Barclay contacted the USS Voyager via the Pathfinder Project. Voyager carried a Mark I EMH, The Doctor
, whose unique knowledge and abilities Barclay hoped would help. Zimmerman initially refused to be treated by The Doctor, whom he saw as inferior to the later Mark III and Mark IV EMHs.
Lieutenant Barclay recruited Counselor Deanna Troi
to mediate between the EMH and Dr. Zimmerman and try to resolve their differences. Eventually, Dr. Zimmerman and the EMH came to an understanding which made it possible for the EMH to come up with a cure for Zimmerman's disease.
Indeed, shortly before The Doctor's departure, the two had established an almost father/son relationship, with The Doctor confessing that he'd hoped Zimmerman would be proud of his achievements if the two of them ever met, and Zimmerman admitting that he was grateful that at least one of the Mark Is was still doing what Zimmerman had designed them for.
(VOY: "Life Line")
To view Doctor Zimmerman's earlier life please click here