Shea Zellweger (born September 7, 1925 in Chicago, Illinois, USA) served as Chair of the Psychology Department at the University of Mount Union from 1969 to 1992. Zellweger’s lifetime achievements and academic contributions to education continue to be significant. He received his Ph.D. in Experimental Psychology at Temple University in 1966. His doctoral dissertation focused on early visual stimulation experience and its later effects on discrimination learning. Zellweger is probably best known for his creation of a simpler and more mentally intuitive system of logic notation called the Logic Alphabet. The Logic Alphabet, also known as the X-stem Logic Alphabet (XLA), is a notation system that contains a unique and visually iconographic approach to learning and performing logic operations.