Otto Jespersen, Danish linguist and academic (b. 1860)

Jens Otto Harry Jespersen (Danish: [ˈʌtsʰo ˈjespɐsn̩]; 16 July 1860 – 30 April 1943) was a Danish linguist who specialized in the grammar of the English language. Steven Mithen described him as "one of the greatest language scholars of the nineteenth and twentieth centuries."