John E. Grayson - is a video game producer. John E. Grayson began his career in 1993 and has worked for companies such as Phoenix Online Studios, Sierra, Sierra On-Line and Activision Blizzard. John E. Grayson's first game was Gabriel Knight: Sins of the Fathers which was released 30 years ago. Best Game John E. Grayson contributed to was Gabriel Knight: Sins of the Fathers. John E. Grayson's latest work is Gabriel Knight: Sins of the Fathers which was released 30 years ago.