Keiller Greig finished second to the Brazilian-born Argentine Horatio Torromé in the 1906 Amateur Figure Skating Championship of Great Britain. The following year, Greig deposed Torromé, who had been the champion the previous two years. Greig won the Public Schools International Challenge Cup at Celerina, Switzerland, in January 1908, and then finished fourth at the Olympics. After losing his British title to Dorothy Greenhough-Smith that same year, he regained the title in 1909 and won it for a third time in 1910, when he was also fourth at the European Championships. Grieg retired from competitive skating shortly afterwards and became a skating judge. He was equally at home on skis as he was on skates, and was also an excellent curler, playing regularly at the Prince’s Skating Club in London. Greig was also a superb marksman and was equally happy on the firing range as he was on the moors of the Scottish Highlands shooting grouse. He was also a fine golfer and was appointed captain of the Ballater GC in Aberdeenshire in 1923.