He oversaw the creation of the Graduate School, created more graduate degrees, integrated the library's card catalog into the Internet in 1983, created the groundwork for a major business incubator, helped to develop the university's surrounding neighborhood, and increased academic grants to over $6.1 million. Fretwell retired as chancellor in 1989. He served as interim president of the University of Massachusetts system from 1991–1992, and in 1998, he served as the interim president of the University of North Florida.