The EMH program was developed on the Jupiter station located in the Sol sector.
He was modeled after his primary programmer/creator, Dr. Lewis Zimmerman. Reginald Barclay briefly
served on the team of scientists who developed him before being re-assigned to the Enterprise-E.
The USS Voyager version of the EMH was first activated after the entire medical staff of the
ship was killed when swept into the Delta Quadrant. The USS Voyager back-up system for
the EMH is currently missing.