Glen Otis Rosenbaum
- Bats Right, Throws Right
- Height 5' 11", Weight 180 lb.
- High School Union Mills High School
Glen Rosenbaum began a decades-long association with the Chicago White Sox in 1955 when the team signed the pitcher. He was assigned to the Dubuque Packers of the class D Mississippi-Ohio Valley League and did very well, going 15-3 with a 3.05 ERA; his ERA ranked second in the league behind Dave Wegerek. He was promoted to the Three-I League the next season. He again finished second in a key pitching statistic as his 15-5 record gave him more wins than anyone in the class B league except Don Nottebart. He also posted a 3.57 ERA.
Rosenbaum continued to climb the farm ladder. In 1957, he was 10-6 with a 3.72 ERA for the Colorado Springs Sky Sox of the Western League; he also appeared for the Indianapolis Indians, making his AAA debut. While he was in AAA after just three seasons, he would never make it to the majors as a pitcher.
Rosenbaum returned to Colorado Springs for most of 1958, going 9-4 with a 3.56 ERA. He again spent some time at AAA, going 1-1 for Indianapolis, and he pitched briefly in AA as well. With the Western League folding after the season, Rosenbaum could not return for a third year there. He remained at class A, again posting a very good record - this time he was 13-4 with a 3.98 ERA for the Charleston ChaSox in their debut season in the South Atlantic League.
Rosenbaum spent the next 6 years moving between AA and AAA (with a brief return to A ball), going 32-22 to finish with a minor-league record of 98-42. He posted a 2.56 ERA for the Indianapolis Indians in 1962, but failed to get called up to the Pale Hose for a single game in a major-league performance.
When Rosenbaum retired in 1968, he remained with the White Sox organization as a batting practice pitcher, finally getting the opportunity to pitch to guys wearing a big-league uniform. He held this job for over 20 years, before an injury derailed his career in 1989, after 35 years of getting paid to throw baseballs. During this period Rosenbaum also served six years as a coach.
After his injury, Rosenbaum stayed with the White Sox, now as a traveling secretary. In 1991 he was named Traveling Secretary of the Year by Major League Baseball. Rosenbaum eventually retired after over 40 years of association with the White Sox.