His first experience with a computer was when he was 13, his first computer was a Sinclair ZX81 he bought in 1981.
In 2014 Ritman appeared in the documentary feature film From Bedrooms to Billions, which tells the story of the British video game industry from 1979 to its release.
- Namtir Raiders, Artic
- Cosmic Debris, Artic
- 3D Combat Zone, Artic
- Dimension Destructors, Artic
- Bear Bovver, Artic
- Match Day series, Ocean
- Batman, Ocean
- Head over Heels, Ocean
- Monster Max, Rare/Titus 
- Super Match Soccer, 1998
Ritman also worked on two other football games that were not published:
- Ritman bio at gamasutra.com
- "Interview with Ritman at amstradmuseum.com". Archived from the original on 7 June 2009. Retrieved 4 November 2007.
- Retro Gamer magazine (Spanish edition) issue 19, pages 136-141
- Jon Ritman's website
- Interview with Ritman at crashonline.org.uk
- Ritman interview at computeremuzone.com
- Ritman interview at tacgr.emuunlim.com