Jacques Keyser (12 October 1885 – 21 March 1954) was a middle-distance runner. Born in Paris, he was the son of a Dutch father and Belgian mother, and could compete for both France and the Netherlands.Sportnieuws. "De avondpost". 's-Gravenhage, 15-06-1908, p. 6. Geraadpleegd op Delpher op 05-08-2022, https://resolver.kb.nl/resolve?urn=MMKB27:017831163:mpeg21:p00006 Keyser took part in the International Cross Country Championships in 1907 and 1911–1913 and won individual and team medals in 1913; his teams placed fourth in other three championships. He competed for the Netherlands at the 1908 Summer Olympics, but failed to reach the finals of the 1500 m and 5 mile races. Between 1910 and 1912 he broke the Dutch national records on the 1500 m (4.11,8), the mile (4.31,4), and the 5000 m (16.10,2), each remaining a record for over a decade.Nederlandse records , page 201
References Jacques Keyser . sports-reference.com Jacques Keyser. trackfield.brinkster.net
Further reading Dutch Olympic Committee