Sir George Cayley, 6th Baronet of Brompton (27 December 1773 – 15 December 1857) was a prolific English engineer and one of the most important people in the history of aeronautics. Many consider him the first true scientific aerial investigator and the first person to understand the underlying principles and forces of flight.In 1799 he set forth the concept of the modern aeroplane as a fixed-wing flying machine with separate systems for lift, propulsion, and control.He was a pioneer of aeronautical engineering and is sometimes referred to as "the father of aerodynamics." Designer of the first successful glider to carry a human being aloft, he discovered and identified the four aerodynamic forces of flight: weight, lift, drag, and thrust, which act on any flying vehicle. Modern aeroplane design is based on those discoveries including cambered wings.He is credited with the first major breakthrough in heavier-than-air flight and he worked over half a century before the development of powered flight, being acknowledged by the Wright brothers. He designed the first actual model of an aeroplane and also diagrammed the elements of vertical flight.Cayley served for the Whig party as Member of Parliament for Scarborough from 1832 to 1835, and in 1838 helped found the UK's first Polytechnic Institute; the Royal Polytechnic Institution (now University of Westminster), serving as its chairman for many years. He was a founding member of the British Association for the Advancement of Science and was a distant cousin of the mathematician Arthur Cayley.