Warren was born in
Islington on 28 February 1952. The son of a
bookmaker, he trained as a
solicitor's clerk with J Tickle & Co on
Southampton Row in London. Warren's first licensed show was held at the Bloomsbury Crest Hotel, in London in 1980, promoting two unknown
United States heavyweights. However, although he had arranged TV coverage, he was blocked from broadcasting the fight by the
British Boxing Board of Control rules preventing first-timers from televising their first fights. However Warren was later given his first TV date with the BBC in a British light welterweight fight between London's champion
Clinton McKenzie and Coventry contender
Steve Early. Warren guided Hamed to become Britain's youngest ever world champion when he beat Steve Robinson to win the WBO Featherweight title at the
Cardiff Arms Park,
Wales, in 1995; he oversaw the ascent of Ricky Hatton to the IBF Light Welterweight Championship of the World after beating
Kostya Tszyu in 2005; and has been with former IBF and WBO/WBC/WBA/Ring Magazine Super Middleweight Champion Joe Calzaghe throughout the majority of his 46 fight unbeaten career. Warren signed the
2004 Olympic Lightweight silver medallist
Amir Khan and guided him to be a world champion in 2009, but the two split in 2010. He continued this post-Olympic record by signing others after the
2008 Olympics. In December 2007, Warren was elected to the
International Boxing Hall of Fame and was inducted in June 2008. On 5 February 2016,
gunmen stormed the Regency Hotel in
Whitehall, Dublin during a weigh-in for the
WBO European
lightweight title bout between
Jamie Kavanagh and Antonio João Bento. The event was a co-promoted between Warren and suspected crime boss
Daniel Kinahan. In 2024, Warren led Team Queensberry in the Queensberry vs. Matchroom 5v5 event held in Riyadh, Saudi Arabia. This unique boxing competition saw Warren and fellow promoter
Eddie Hearn each select five fighters to compete, with scoring based on two points for a knockout, one point for a decision win, and double points for victories by team captains.
Hamzah Sheeraz captained Team Queensberry. Under Warren's leadership, his team achieved a clean sweep, winning all matches and delivering an embarrassing 10-0 scoreline against Hearn's team. Warren was given a lifetime achievement award at the 2025 Sports Industry Awards in London in May 2025. ==Sports network==