Professor Charles Xavier or Professor X is the mutant leader of the X-men. Leading them into battle against evil mutants and a mutant hating human populace
His leadership has lead the X-men and their many team configurations like X-Factor, X-Force, New Mutants and many other sub groups.
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Without his leadership one can only wonder what would have been the fate of mutants like Cyclops, Marvel Girl, Iceman, Beast, Angel, Wolverine, Storm, Warpath, Deadpool, Psylock, Colossus, Kitty Pryde, Jubilee, Nightcrawler, Archangel, Havok and many others