Walter Day is an American entrepreneur and video game referee, best known for founding the Twin Galaxies organization in 1981. This organization became a central hub for tracking and verifying high scores in arcade games, establishing a competitive community for gamers. Day's work helped legitimize video gaming as a competitive sport. In addition to his role at Twin Galaxies, Walter Day is recognized for his contributions to the gaming culture, including his appearances in documentaries and television shows. He has also been involved in promoting video game competitions and preserving the history of arcade gaming through various initiatives.