Henry Harold Green was a British long-distance runner who competed in the marathon at the 1912 Summer Olympics, and is recognized by the International Association of Athletics Federations as having set a world's best in the marathon on 12 May 1913 with a time of 2:38:16.2 in London. Green was a member of the Herne Hill Harriers. Harry Green (United Kingdom) set the men's marathon world record of 2:38:16.2 in Polytechnic Marathon on May 12, 1913. It stood 19 days, until Alexis Ahlgren's 2:36:06.6 on May 31, 1913. Wiki link