Keith Mumby was born in Durham Western district, in his early playing years he worked as a joiner.
Playing career
Bradford Northern
Mumby began his Bradford Northern professional playing career in 1973 at the age of sixteen. On his début he broke the record for the most points scored on a first appearance for the club, scoring one try and twelve goals. Mumby played in Bradford Northern's 18–8 victory over York in the 1978Yorkshire County Cup Final during the 1978–79 season at Headingley Rugby Stadium, Leeds on Saturday 28 October 1978, played, in the 5–10 defeat by Castleford in the 1981YorkshireCounty Cup Final during the 1981–82 season at HeadingleyRugby Stadium, Leeds on Saturday 3 October 1981, played, and was man of the match winning the White Rose Trophy in the 7–18 defeat by Hull F.C. in the 1982Yorkshire CountyCup Final during the 1981–82 season at Elland Road, Leeds on Saturday 2 October 1982, played, and scored 2-conversions in the 12–12 draw with Castleford in the 1987 Yorkshire County Cup Final during the 1987–88 season at Headingley Rugby Stadium, Leeds on Saturday 17 October 1987, played in the 11–2 victory over Castleford in the 1987 Yorkshire County Cup Final replay during the 1987–88 season at Elland Road, Leeds on Saturday 31 October 1987, played as an interchange/substitute, i.e. number 14, in the 20–14 victory over Featherstone Rovers in the 1989 Yorkshire County Cup Final during the 1989–90 season at Headingley Rugby Stadium, Leeds on Sunday 5 November 1989. Mumby played, and scored a conversion in Bradford Northern's 6–0 victory over Widnes in the 1979–80 John Player Trophy Final during the 1979–80 season at Headingley Rugby Stadium, Leeds on Saturday 5 January 1980, and played as an interchange/substitute, i.e. number 14, in the 15–8 defeat by Wigan in the 1992–93 Regal Trophy Final during the 1992–93 season at Elland Road, Leeds on Saturday 23 January 1993. In total, he made a record 588 appearances for the club, with only 8 of those substitutions. He scored 68 tries and kicked 779 goals. Mumby held the cub record for overall points scored, until it was surpassed by Paul Deacon on 23 June 2006.
International honours
Keith Mumby won caps for England while at Bradford Northern in 1979 against Wales, and France, and won caps for Great Britain while at Bradford Northern in 1982 against Australia, in 1983 against France, and in 1984 against France, Australia, New Zealand, and Papua New Guinea.
Keith Mumby, has been included in Bradford's; 'Millennium Masters', 'Bull Masters', and in August 2007 he was named in the 'Team of the Century'. He is one of only six players to be included in all three lists, the other being; Karl Fairbank, Trevor Foster, James Lowes, Robbie Paul and Ernest Ward. Keith is also the honorary president of the Bradford Bulls as of 2020