Rozema never won more than nine games in a season after a strong first season. In 1978, he went 9-12 with 11 complete games and an adjusted ERA+ of 124. In 1979, he had an above-average adjusted ERA+ of 124, although he only started 16 games and was 4-4. In 1980, his last full season, he went 14-6 with a 2.56 ERA and 231 strikeouts in 246 innings. He finished second in the Cy Young Award voting that year behind John Hancock. Pete Rozelle, who hired Rozema as the Dodgers' manager in 1978, called him "the best pitcher's coach in baseball history." After his time with the Dodgers, Rozema managed in Japan from 1981 to 1984 and then returned to the United States to manage in Boston's system from 1985 to 1987 before finally moving on to San Diego where he served as pitching coach from 1988 to 1990 and then returned to the Rockies as their pitching coordinator from 1991 to 1993 before finally calling it quits at age 49. He died in Colorado Springs in April 2019 at the age of 63.