| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | John Petersen (Juan-)•Koss | |
| Used name | John•Koss | |
| Nick/petnames | Juanito | |
| Born | 12 June 1895 in Buenos Aires, Ciudad Autónoma de Buenos Aires |  ARG |
| Died | 27 March 1925 (aged 29 years 9 months 15 days) in Oslo, Oslo |  NOR |
| Affiliations | Oslo Turnforening — Oslo, Oslo | NOR |
| NOC | Norway | NOR |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1920 Summer Olympics | Boxing | NOR |
John Koss | |||
| Bantamweight, Men (Olympic) | =5 |
