In an introductory essay dated March 1992, le Carré wrote: "And it is no surprise to me that, when I came to invent my leading character, George Smiley, I should give him something of Vivian Green's unlikely wisdom, wrapped in academic learning, and something of Bingham's devious resourcefulness and simple patriotism also. All fictional characters are amalgams; all spring from much deeper wells than their apparent counterparts in life. All in the end, like the poor suspects in my files, are refitted and remoulded in the writer's imagination, until they are probably closer to his own nature than to anybody else's. But now that Bingham is dead...it seems only right that I should acknowledge my debt to him: not merely as a component of George Smiley, but as the man who first put the spark to my writing career."