Nick Hampton Vaughan (’47, ’48 M.S.), 90, Professor Emeritus of mathematics, died May 18 in Sugar Land. As a student at North Texas, where he earned bachelor’s and master’s degrees in math, he was an officer in the Mathematics Club, played tennis and was a teaching fellow. He also studied at Purdue and later earned a doctorate at Louisiana State University.He joined the North Texas faculty in 1958 and was named a Professor Emeritus in 2002. He served as a staff sergeant in the U.S. Army in the Pacific during World War II. In the 1950s, he worked as a mathematician at the U.S. Naval Ordnance Plant in Indianapolis studying aircraft fire control systems, as a research associate in aircraft vulnerability studies at Purdue’s Statistical Lab, and as a senior aerophysics engineer in weapons systems evaluation at Convair in Fort Worth.