Walter R. Evans (January 15, 1920 - July 10, 1999) was born in St. Louis and received his bachelor's degree in Electrical Engineering from Washington University in 1941. He worked as an instructor at Washington University from 1946 to 1948. He is widely known for his 1948 invention of the root locus method (http://www.spirule.com), which is now a key tool in control theory. He received his master's degree in Electrical Engineering from UCLA in 1951. Over the course of his career, he worked for such companies as General Electric, Rockwell International, and Ford Aeronautic Company. In recognition of his contributions to control theory, he received both the 1987 American Society of Mechanical Engineers Rufus Oldenburger Medal and the 1988 AACC Richard E. Bellman Control Heritage Award.