Summary
- Full name: Mark John Legard Orr
- Born: Belfast, 1955
- Chess honours:
- International Master title: 1988
- Olympiad team: 1984, 1986, 1988, 1990, 1992, 1994, 1996, 2000, 2002
- European Championships team: 1989, 1999
- Irish Champion: 1985, 1994
- Ulster Champion: 1985, 1988, 1989, 2002
- 1st Ulster Open: 1988
- Occupation: mathematician and computer programmer
- Publications:
- ICU - Irish Chess Union webmaster
