When Charles Xavier founded the X-Men, Forge joined them and together they fought for a future where humans and mutants could coexist in peace.
After some time, the X-Men reached their goal and they became media heroes. Forge at some point became their leader and Xavier's superior. The two would usually disagreed with each other about the X-Men, as Forge considered the X-Men servants of the community and not as a force against evil in the world as Xavier sees them.
When the X-Men were attacked and almost slaughtered by the Followers of Apocalypse, Forge ordered them to return fire. It is unknown if Forge survived the battle and, if he did, it is unlikely that he remained their leader after Jean and Cyclops took over the school after Xavier's death.