Glenn Shafer is an American statistician known for his contributions to the field of probability and statistics. He is particularly recognized for developing the theory of Dempster-Shafer theory, which provides a framework for reasoning with uncertainty. This theory has applications in various fields, including artificial intelligence, decision-making, and risk assessment. Shafer has also worked on Bayesian statistics and has published numerous papers and books on these topics. He has held academic positions at several institutions, including Rutgers University, where he has influenced many students and researchers in the field of statistics.