George Parker Bidder: Brief account of his career, based on the biography "The Calculating Boy" by his great-great-grandson, E.F. Clark.George Parker Bidder - (1806-1878): Short biography and portrait.George Parker Bidder: The Calculating Prodigy: Essay about his life and his ability and exhibitions of mental arithmetic. Written by Joyce Linfoot for the Institute of Mathematics and its Applications in 1987.