Harry Greb (born Edward Henry Greb on June 6, 1894 in Pittsburgh; died October 22, 1926) to Pius and Annie Greb was a boxer. He was World Middleweight boxing Champion from 1923 to 1926 and American Light Heavyweight title holder 1922 - 1923. He fought a recorded 299 times in his 13 year-career, against the best opposition the talent-rich 1920's could provide him, frequently squaring off against light-heavyweights and even heavyweights. He is believed by many ring historians to be one of the greatest pound-for-pound fighters in history - if not the greatest.

Though no films of Greb in action are known to exist, contemporary accounts describe him as a highly aggressive, very fast, swarming style of fighter who buried his opponents under a blizzard of punches (the fact that he threw so many punches so quickly is the reason why he scored only 48 KOs in 299 recorded bouts - to land a punch with maximum power requires one to plant one's feet, to be momentarily still, something that 'the Human Windmill' rarely was in the ring). Greb was also a master at dirty fighting and had no qualms about employing all manner of dubious tactics, such as spinning his opponent and using the heel and laces of his gloves. The 'Pittsburg Wildcat' was also very durable, suffering only two stoppage losses, one a KO defeat very early in his career and the other a retirement due to a broken arm.
Source : Wikipedia