Dallas S. Lankford IV died of natural causes June 29, 2020, at his home in Ruston, LA. Born May 16, 1942, to Willie Lee and Dallas S. Lankford, III, in Milton, Florida, where his father was stationed for flight training, he was raised in and around Quitman, Texas, and attended the University of Texas at Austin, where he received his B.S., M.S., and Ph.D., all in mathematics.