Though he had a long and successful career as a civil servant, von Kempelen was most famous for his construction of The Turk, a chess-playing automaton presented to Maria Theresa of Austria in 1769. The machine consisted of a life-sized model of a human head and torso, dressed in Turkish robes and a turban, seated behind a large cabinet on top of which a chessboard was placed. The machine appeared to be able to play a strong game of chess against a human opponent, but was in fact merely an elaborate simulation of mechanical automation: a human chess master concealed inside the cabinet puppeteered the Turk from below by means of a series of levers. With a skilled operator, the Turk won most of the games played during its demonstrations around Europe and the Americas for nearly 84 years, playing and defeating many challengers including statesmen such as Napoleon Bonaparte and Benjamin Franklin.