Thaddeus Vincenty
Thaddeus Vincenty (born Tadeusz Szpila; 27 October 1920 – 6 March 2002) was a Polish American geodesist who worked with the U.S. Air Force and later the National Geodetic Survey to adapt three-dimensional adjustment techniques to NAD 83. He devised Vincenty's formulae, a geodesic calculation technique published in 1975 which is accurate to about half a millimeter.