Sean began karting as a teenager in Spain. In his later years, he took a job at Akita and his contract stipulated he must compete for the racing team as a result of his experience.
Always a quick driver, Williams has been instrumental in the success of Akita V2 since its inception in 2010, finishing runner up in his first year, winning the inters championship at the first attempt and being a consistent front-runner and championship challenger in the Clubman championship.
2010 Rookie Endurance Championship 2nd
2011 Intermediate Endurance Championship 1st
2012 Clubman Endurance Championship 7th
2013 Clubman Endurance Championship 3rd
2014 Clubman Endurance Championship 3rd
2015 Clubman Endurance Championship 1st