Very little statistical evidence exists of Oliver's career, as this was right around the turn of the 20th century. He was known for his sensational skating ability, he actually started out as a goaltender. But he became a star center in the Ontario Hockey Association. Such a star that he was inducted into the Hockey Hall of Fame in 1961.
Seibert, who was once said to have beaten a horse in a one mile race while skating on the frozen Grand River (although some reports suggest it was actually Oliver's father Frank who did this), was part of a prominent sports family. In fact the Seiberts often iced a team of strictly family members who competed against all comers and regularly won. His father was a celebrated skater though it is not believed he ever played much hockey. His son Earl went on to an outstanding NHL career and he too was inducted into the Hockey Hall of Fame. The Seiberts were the first father/son combination to be elected into the Hockey Hall of Fame as players.