Donald Kirkpatrick
Donald L. Kirkpatrick (March 15, 1924 – May 9, 2014) was Professor Emeritus at the University of Wisconsin in the United States and a past president of the American Society for Training and Development (ASTD). He is best known for creating a highly influential 'four level' model for training course evaluation, which served as the subject of his Ph.D. dissertation in 1954.