Kenneth George Aston, MBE was an English teacher, soldier, and football referee, who was responsible for many important developments in football refereeing - including the yellow and red penalty card system.

In association football, the referee is the person responsible for interpreting and enforcing the Laws of the Game during a match. The referee is the final decision-making authority on all facts connected with play, and is the match official with the authority to start and stop play and impose disciplinary action against players and coaches during a match.