Charles Xavier is considered to be the world's strongest telepath, almost without peer. Aided by Cerebro, his range for telepathic contact is almost global, and he is skilled enough to discern one specific mental pattern among millions with time and concentration. He is skilled in using his telepathy for therapeutic means as well, aiding trauma victims in recovery and assisting those under his care who have suffered psychic ailments.
Along with Erik Lehnsherr and Gabrielle Haller (with whom a brief relationship would eventually produce a son, David Haller), Charles turned the mansion he had grown up in into a school for mutants like himself, training them in their abilities and helping them find their place in the world. In time, he and Erik had a schism in their views on the coexistence of humans and mutants, resulting in Erik leaving to become the mutant terrorist known as Magneto. Determined to oppose Erik's madness and prove that his dream of mutant-human coexistence was worth pursuing, Charles formed the X-Men, joined by a number of his students.
With the creation of the Xavier Institute and the reduction in student numbers at the school, Charles has resumed his role as headmaster, once again taking an active role in the life of the school.