Marlon Harewood transitioned from a prolific English professional footballer to an entrepreneur, founding a bespoke vehicle customization company and working as a football coach and ambassador. After making his league debut in 1998, Marlon Harewood quickly established himself as a formidable striker, notably winning both the Finnish championship and the Finnish Cup during a loan spell with FC Haka in 1998. Following a further loan with Ipswich Town in 1999, Harewood became a key offensive player for Nottingham Forest. During his tenure, he scored 51 goals in 124 league games and 58 substitute appearances, forming a strong partnership with David Johnson that contributed to 50 combined goals in the 2002–03 season.

His extensive playing career continued with various clubs, including loan spells at Wolverhampton Wanderers (2009) and Newcastle United (2009), before permanent moves to Blackpool (2010) and Guangzhou R&F in China (2011), where he contributed to their promotion to the China Super League in 2011. He later had stints with Nottingham Forest (2011), Barnsley (2012), Bristol City (2013), Hartlepool United (2014), and Nuneaton Town (2015), retiring from professional football in 2016. Following his decorated playing career, Harewood transitioned into entrepreneurship while maintaining a strong connection to the sport. He founded and serves as Director for AC13 Premier Lifestyle, a company specializing in bespoke vehicle customization.

His continued involvement in football includes an academy coach role at Nottingham Forest, a club where he first made his mark. Additionally, Harewood acts as an ambassador for both West Ham United and Nottingham Forest, leveraging his deep understanding of the game and his storied career. He remains an influential figure in the sports world, actively exploring new ventures including hosting a podcast focused on guiding athletes through their transition into business.