Berhard Hofmann-Wellenhof, born in 1951, is Professor for Navigation and Satellite Geodesy at the TU-Graz. He is Co-Author of numerous books and papers, among them "Global Positioning System", 5th ed., SpringerWienNewYork.
Herbert Lichtenegger, born in 1941, is assistant professor at the Institute for Navigation and Satellite Geodesy at the TU-Graz. He is Co-Author of numerous books and papers, among them "Global Positioning System", 5th ed., SpringerWienNewYork.
Elmar Wasle, born in 1975, works for a private enterprise and is specialised in GPS.