Bruce Leonard Cathie (11 February 1930 - 2 June 2013) was a New Zealand airline pilot who wrote seven books related to flying saucers and a "World energy grid".
His central thesis was that he could use mathematics to describe a grid-like pattern on Earth (i.e. the Electro-dynamic field on Earth) that powers flying saucers and controls the dates and places where nuclear bombs can function; in his book "The Harmonic Conquest of Space".