Cass Pennant is the best-selling author of eight football fan-related books, five of which have been UK Top Ten bestsellers. Pennant is also the eponymous hero of the British feature film Cass (2008), based on his best-selling autobiography about his turbulent life and character, constantly strengthened through adversity. Cass was directed by Jon. S. Baird and filmed starring Nonso Anozie, Nathalie Press and Tamer Hassan.

It was a culmination of events and a violent lifestyle as a leading member of notorious 80s football gang the ICF that saw him convicted and sent inside prison and it was at this time that Pennant began to write. In the range of hooligan literature the singular elements of humane dynamism and sympathy within Pennant’s writing stood out. His story showed an escape route for those brutalised by their early experiences, a way out of the dead end towards moral redemption and peace. As an acknowledged authority on the culture of hooliganism and gang culture, he advised on numerous TV and film projects, including Guy Ritchie's acclaimed Snatch, Lexi Alexander’s Green Street/Hooligans, Alan Clarke’s The Firm plus Bravo TV's The Real Football Factories series, ITV’s Bouncer’s series and Ian Stuttard’s award winning Thames TV documentary Hooligan.

When in 2005 he realised that publishing was the world for him, his interest moved on to developing and promoting other writers and with backing he founded Pennant Books and published a wide array of valuable titles in the sport, biography and crime genres.

Today he is concentrating mainly with film after being instrumental in the 2011 production of Casuals, a feature film DVD documentary exploring the early 80s fashion movement instigated by young football supporters from the terraces of British football stadiums. At the time of writing he is working on turning a book he first published about Irish boxer Big Joe Egan into a feature film.