Grant was Marquette's leading scorer during the 1950-51 season (12.8 ppg). He also led the team in rebounding in both 1950-51 (10.5 rpg) and 1951-52 (9.1 rpg). He also averaged nine points per game during that season.
He played for the Milwaukee Allen-Bradleys of the National Industrial Basketball League (NIBL) and was named to their All-Star team three times (1952-53, 1953-54, and 1954-55).
In the 1995-56 AAU National Semi-Final loss to the Buchan Bakers (Seattle, WA), Wittberger scored nine points which complemented a twenty-point performance by ex-Marquette star Terry Rand, who was in his first season with the Milwaukee Allen-Bradleys.