Michael Lumb was born 12 February 1980 in Johannesburg, South Africa and is the son of prolific Yorkshire opener Richard Lumb. His uncle Tony Smith represented Natal for 12 seasons. He was educated St Stithian’s College in Johannesburg and played for South African Under 19s as an all-rounder in one test and eight limited overs internationals, including the World Youth Cup in 1997/98. He took 4-43 with his right-arm medium bowling in one limited-overs contest versus England Under-19 at Centurion, the England team including Paul Franks, Graeme Swann and Richard Logan.
Lumb made his way through the junior teams in Transvaal before returning to his roots to play for Yorkshire. A hard-hitting left hand batsman, Lumb made his Tyke debut in May 2000, scoring 2 and 66 not out in a four-day first-class friendly against the Zimbabweans. A knee injury in 2001 meant that Lumb only played only four games in Yorkshire's championship winning team that year, although he did record a maiden first-class hundred against Leicestershire. In doing so Lumb became part of only the fourth father-and-son pair to score centuries for Yorkshire.
Lumb made progress in 2002, becoming a regular member of both the championship and limited-overs sides and, in 2003, scored 917 championship @39.86. He was selected for the ECB National Academy squad the following winter but failed to kick on as people expected and was dropped during the 2005 season. He had a top score of 144 in 2006 and scored 963 first-class runs but at the end of the season, decided against renewing his contract and moved to Hampshire.
Hampshire progressed to the Friends Provident Trophy final in 2009 and Lumb shared in a 93 run opening partnership with James Adams against Sussex as Hampshire gained a six wicket win. In the same season, Lumb made his then highest first-class score against Notts making 219 runs in Hampshire's first innings at Trent Bridge. Lumb toured the UAE with England Lions in February 2010.
Lumb signed with the Sydney Sixers for Australia’s inaugural Big Bash League and was part of the Sixers squad that won the 2012 T20 Champions League. Lumb scored an unbeaten 82 in the final against Lions in Johannesburg and was named man of the match.
Lumb was selected in England's fifteen man squad for the 2010 ICC World Twenty20 held in the West Indies, making his debut and playing in all seven matches, forming a fast-paced opening partnership with Craig Kieswetter. Lumb scored 137 runs @19.57 in the tournament which was won by England. Lumb ended on a high note by collecting a winner’s medal, as England defeated Australia by seven wickets. Overall Lumb played in 27 international T20 games scoring 552 runs @21.23.
Lumb made his ODI debut against the West Indies in February 2014, where he scored 106 in Antigua becoming only the second cricketer to score a century on his England ODI debut. In the same tour he scored his highest T20 score (63 at Bridgetown) and a few months later he was part of England's 2014 World T20 Cup squad in Bangladesh, playing in all of England's matches. In all he played three limited overs internationals for England scoring 165 runs @55.00.
Lumb joined Notts in 2012, receiving his Notts cap in his first season. White-ball opener Lumb was part of the team that won two Lord’s Trophies, versus Glamorgan (Yorkshire Bank Cup in 2013) and Surrey (Royal London Cup in 2017). In 2016, Lumb hit three tons in the Royal London competition including 184 versus Northants at Trent Bridge, adding a Notts List A best of 342 for the opening wicket with Riki Wessels. Nine of his 21 first-class tons were scored for Notts, including a career best 221no versus Derbyshire at Trent Bridge in 2013. He scored 4,160 first-class runs @33.62 for Notts in 75 matches (2012-2017). In List A cricket for the County Lumb scored 1,706 runs @32.80 with 4 centuries. In 48 T20 matches for Notts, Lumb scored 1,116 runs @24.80 with a top score of 96 at The Riverside, Chester-le-Street in 2013, scoring at a rate of 142 runs per 100 balls.
In July 2017, Lumb was forced to retire from cricket due to an ankle injury and is currently Client Director for the Phoenix Management Group which represents leading cricketing personalities.