Upon graduation from Pittsburgh, Bowser served as an assistant at
Grove City College under
Guy "Chalky" Williamson. After the 1923 season, Williamson left for the Pittsburgh football staff, and Bowser took over as Grove City head coach. The Grove City Crimson went 3–5–1 in his first season, but improved in the next two years. In 1925, they posted a 7–1 record, with the sole loss coming against
West Virginia. The next season, Grove City finished with a perfect 7–0 mark, including a 3–0 victory against
Bo McMillin's
Geneva College which defeated
Harvard. In 1939, Bowser returned to Pittsburgh as its head coach, and served in that position through the 1942 season. He resigned his post in January 1943 to take a
commission in the United States Navy during
World War II. He was replaced by
T formation innovator
Clark Shaughnessy. ==Later life and death==