A strong right-handed pitcher, Hollrah was drafted by the Philadelphia Phillies in 1965 while he was playing for the University of Missouri at Columbia. In 1966, he graduated from Mizzou and was drafted by the Atlanta Braves and the Chicago White Sox. He played in the White Sox farm system from 1966 to 1968. In 1967, he pitched for the White Sox farm team in Appleton, Wisconsin. He was named the Most Valuable Player with eleven wins and only two losses. His team won the Midwest League championship. Hollrah pitched for the University of Missouri at Columbia from 1962 to 1966. His team won the Big Eight championship three consecutive years in 1963, 1964, and 1965. In 1964, his Mizzou team finished second at the College World Series in Omaha. The 1964 team was inducted into the University of Missouri Hall of Fame. In the late 1950s, Hollrah pitched for St. Charles High School. He sponsored and coached youth teams in the St. Louis area for seven years. He was an outfielder for two seasons at Grambling State University in Louisiana. He was selected to the Southwest Athletic Conference All-Freshman team with a batting average of .333, and ten assists as an outfielder. Collins was an outfielder and pitcher for two seasons with Harris Teachers College. He was the player-manager of the St. Louis Blazers semi-pro team for eight seasons. He was named to the NBC all-star team in 1976. In 1980, the Blazers were co-champions of the Heine Meine tournament, and Collins was selected to the All-Tournament team. Collins coached baseball at the Wohl Community Center in North St. Louis. He umpired in various summer leagues when not playing. In 1975, he was picked to umpire the Missouri-Illinois all-star game at Busch Stadium.