He was selected by the Washington Capitals in 1980 but never really caught on during his three seasons with the club. He spent plenty of time either warming the bench or playing in the AHL with the Hershey Bears. His frustration grew as he found it difficult to improve with such limited ice time being offered.
In 1983, he was liberated in a trade that sent him to the Hartford Whalers. Once settled with his new team, Robertson went to work to shed the goon image that tended to accompany his role. He hopped onto a line with Greg Malone and Bobby Crawford and for the first time in his NHL career, began to put up some offensive numbers to compliment his penalty minutes.
But his momentum came to a crashing halt after a fight with the Habs' Shayne Corson in 1986. Robertson fell to the ice and broke two bones in his leg. As a result, he missed the remainder of the young season. From then on, he struggled to regain his earlier form. He was traded to the Detroit Red Wings midway through the season that followed. In the Motor City, Robertson plodded along for a year and a half before being demoted to play for Adirondack of the AHL.
In 1990-91, he picked up a couple of games with Rochester and Albany before hanging up his blades for good.
Courtesy of the Hockey Hall of Fame