Professor John Grey worked as a teacher in the History Department at Bard College.
John was the husband of Elaine Grey, and the father of Roger, Liam, Sara, Julia and Jean Grey, founding member of the X-Men.
John and his wife were temporarily transformed into demons by the Goblin Queen, a clone of Jean.
After the death of Sara, and possibly of her husband Paul, John and Elaine took care of their grandchildren, Gailyn and Joey.
When Operation: Zero Tolerance occurred, John was aided by X-Man, his alternate reality grandson, in saving Joey and Gailyn.
John Grey was killed by Shi'ar Death Commandos when they tried to completely eliminate the Grey Genome.
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