Ko Cornelissen

Jacobus Gerardus “Ko” Cornelissen was a Dutch boxer who was a six-time national champion. He won his first title at the age of 16.
Cornelissen competed in the 1924 Summer Olympics in Paris. After winning the first round by decision against Alf Johan Pedersen from Norway, he lost in the second round against Patrick “Paddy” Dwyer, alias Rocky, from Ireland.
Cornelissen was a member of D.O.S Amsterdam for 25 years, and won several National titles:

1920 Featherweight
1921 Lightweight
1923 Welterweight
1925 Unknown weight class
1926 Middleweight
1927 Middleweight

After his boxing career he acted for various years as a boxing referee. Shortly after the Second World War he contracted typhus and subsequently emphysema from which he died in 1954.

Jan Cornelisse

Due to sloppy administration in 1924, Cornelissen has until recently been known as "Jan Cornelisse" in official Olympic records. Of the nine Dutch boxers at the 1924 games, five were registered under the wrong name.