Who is John Galt?

"Who is John Galt?" Edit
The book's opening line, "Who is John Galt?", becomes an expression of helplessness and despair at the current state of the novel's fictionalized world. The book's protagonist, Dagny Taggart, hears a number of legends of Galt, before finding him. In one legend Galt seeks the lost island of Atlantis, in another he discovers the Fountain of Youth. After eventually joining Galt's cause, Taggart learns that all of the stories have an element of truth to them. She names the Colorado spur of her railroad line the "John Galt Line" which surprises many people. When asked "Who is John Galt?", she replies "We are!"
https://en.wikipedia.org/wiki/John_Galt