|Cause of death||Tuberculosis|
|Resting place||Albany Museum|
|Occupation||Assistant to a disabled railway signalman|
Jack was the pet and assistant of double leg amputee signalman James Wide, who worked for the Cape Town–Port Elizabeth Railway service. James "Jumper" Wide had been known for jumping between railcars until an accident where he fell and lost both of his legs. To assist in performing his duties, Wide purchased the baboon named Jack in 1881, and trained him to push his wheelchair and to operate the railways signals under supervision.
After initial skepticism, the railway decided to officially employ Jack once his job competency was verified. The baboon was paid twenty cents a day, and half a bottle of beer each week. It is widely reported that in his nine years of employment with the railway company, Jack never made a single mistake.
- Conway Morris 2003, p. 242.
- Williams, Michael (2 August 2012). "Stranger Than Fiction: Jack the Signalman". Knoxville Daily Sun. Retrieved 27 October 2014.
- Cheney & Seyfarth 2008, p. 31.
- Wallechinsky 1975, p. 697.
- "Signalman Jack: The Baboon Who Worked for the Railroad—and Never Made a Mistake". www.mentalfloss.com. 11 October 2018. Retrieved 14 March 2020.
- Cheney, Dorothy L.; Seyfarth, Robert M. (2008). The Primate Mind in Myth and Legend. University of Chicago Press. ISBN 978-0226102443.
- Conway Morris, Simon (2003). Life's Solution: Inevitable Humans in a Lonely Universe. Cambridge University Press. p. 242. ISBN 9781139440806.
- Wallechinsky, David (1975). The People's Almanac. Doubleday. p. 697. ISBN 9780385040600.