Arnold Russek, a theoretical atomic physicist, born July 13, 1926, in New York, passed away on October 13th, 2020, in Colorado. As a young man of 18, he served honorably as a radio engineer in the Pacific during WWII. He earned his Ph.D. at the Courant Institute at New York University in 1953, and taught physics for 40 years at the University of Connecticut, having Professor Emeritus status when he retired in 1992. Prof. Russek published notable works on processes on hydrogen beams and atomic collisions. He is remembered by many of his students as not only an excellent teacher but also a kind and supportive mentor.