Bonnie Litwiller
Bonnie Helen Litwiller (February 14, 1937 – January 27, 2012) was an American mathematics educator and textbook author, who worked as a professor of mathematics at the University of Northern Iowa. Life. Litwiller was born on February 14, 1937 in Morton, Illinois. She studied mathematics education at Illinois State University, earning bachelor's and master's degrees in 1959 and 1960. She earned a second master's degree in 1965 at Indiana University, and completed a doctorate (Ed.D.) there in 1968. Her doctoral dissertation was "Enrichment: A Method of Changing the Attitudes of Prospective Elementary Teachers Toward Mathematics