As a senior, he contributed to the team winning the state championship, while scoring 20 points and 9 rebounds per game.

He set Dodge City Tournament records with 93 points and 42 field goals, while helping his team finish in second place.

[3] Robertson was selected by the Los Angeles Lakers in the fourth round (88th overall) of the 1977 NBA draft.

[5] On February 18, 1979, he signed as a free agent with the Golden State Warriors, to provide depth after Phil Smith was lost for the season with an Achilles injury.

[6] On June 21, 1981, he was invited by the Atlanta Hawks to participate in a three-day rookie and free-agent camp.