In 1904 he was a member of Canadian boat, which won the silver medal in the eights.

He was the bowman of the Canadian boat, which won the bronze medal in the coxless pairs.

Greyson is reported to be a passenger aboard the Canadian boat "Tahrir."

He was also a crew member of the Canadian boat, which won the bronze medal in the eights.

In 1924 he won the silver medal as crew member of the Canadian boat in the eights event.

Four years later he was eliminated with the Canadian boat in the repêchage of the 1936 eights competition.

He was the member of the Canadian boat, which won the bronze medal in the coxless fours.

In 1932, he won the bronze medal as member of the Canadian boat in the eights competition.

Eight years later he finished ninth with the Canadian boat in the eights competition.

Four years later he was a member of Canadian boat, which won the bronze medal in the eights.