Robertson enrolled at
Eastern Arizona Junior College. As a freshman
shooting guard, he averaged 21 points, 5 assists and 8 rebounds per game. As a sophomore, he averaged 23 points, 6 assists and 10 rebounds per game. He set Dodge City Tournament records with 93 points and 42 field goals, while helping his team finish in second place. He received All-tournament and honorable-mention
All-American honors. Robertson transferred to
West Virginia University for his junior season. He averaged 17.9 points, 3.6 assists and 4.4 rebounds. As a senior, he scored 18.1 points, 3.3 assists and 4.0 rebounds. He had a career-high 34 points and 10 assists against
Richmond University. He made a career-high 12 rebounds against the
University of New Hampshire. He posted 7 steals against
Virginia Tech. Robertson registered 57 starts, 1,026 points, while averaging 18.0 points (seventh in school history), 3.4 assists and 4.2 rebounds per game in two seasons. In 2020, he was inducted into the
West Virginia University Sports Hall of Fame. ==Professional career==