Mark Bonner joined Cambridge United in June 2011, initially working in a number of positions in the club’s academy. Bonner was named as first team coach in January 2018, and he was subsequently promoted to assistant head coach. Later in the year he took temporary charge of the first team before the appointment of Colin Calderwood as manager.
Calderwood’s departure in January 2020 again saw Bonner take temporary charge of first team duties, overseeing four wins in his first four matches in charge. In March 2020, Bonner was named permanent head coach of Cambridge United but due to the curtailing of the 2019-20 season caused by the COVID-19 pandemic, his first match as permanent head coach did not come for six months until Cambridge United knocked Championship side Birmingham City out of the first round of the 2020-21 EFL Cup.
Bonner’s first full season as a manager was hugely successful. In September, he was named League Two manager of the month and he received the award again in January. He went on to lead Cambridge United to a second placed finish and promotion to League One.