The Doctor

Created on Jupiter Station to be an Emergency Medical Holographic program
Installed on the USS Voyager, designed to function in emergency situations only
2371: Forced to run full time after Voyager was stranded in the Delta Quadrant;
Became Chief Medical Officer due to Dr. Fitzgerald & the entire medical staff dying
Developed into a brilliant yet compassionate individual over the years
2373: Gained his Mobile Emitter, a piece of technology from the 29th century
2377: Command subroutines were added to his program, turning him into an ECH;
Took command in emergencies where the command crew was incapacitated
2378: Retuned to the Alpha Quadrant with Voyager’s crew, remained with Starfleet
2384: Assigned to the USS Dauntless as one of the ship's Chief Medical Officers
2385: Assigned to the USS Voyager-A as Chief Medical Officer
2385: Assigned to the USS Voyager-A as Chief Medical Officer
2693: Added an aging program to his matrix
3193: Assigned as Chief Medical Officer aboard the USS Athena
Served as an instructor, taught Xenobiology at Starfleet Academy
After SAM was in danger of shutting down, the Doctor and Ake took her to Kasq
They realized that SAM being programmed without the memories of a childhood was what led to her termination
Had the Makers rebuild SAM, spent 17 years on Kasq, only two weeks on Earth, raised SAM as his daughter