Sadri Hassani is Professor Emeritus of physics at Illinois State University and Adjunct Professor at the University of Illinois at Urbana-Champaign. He received his PhD in theoretical physics from Princeton University and is currently on the editorial board of Springer-Nature’s Graduate Texts in Physics series. His first publication, Mathematical Physics, a graduate-level textbook now in its third edition, has become an authoritative text on the subject. His current area of interest is using physics as a venue for the dissemination of critical thinking. He lives with his wife in Champaign, IL.