John Day - is a video game producer. John Day began his career in 1985 and has worked for companies such as Sir-Tech. John Day's first game was Wizardry: Proving Grounds of the Mad Overlord which was released 38 years ago. Best Game John Day contributed to was Wizardry: Proving Grounds of the Mad Overlord. John Day's latest work is Wizardry: Proving Grounds of the Mad Overlord which was released 38 years ago.