Full name: John Haakon Johnsen
Gender: Male
Born: January 5, 1892 in Oslo, Oslo, Norway
Died: August 24, 1984 in Oslo, Oslo, Norway
Affiliations: Oslo IL, Oslo (NOR)
Country:
Norway
Sport: Swimming
| Games | Age | City | Sport | Event | Team | NOC | Rank | Medal | |
|---|---|---|---|---|---|---|---|---|---|
| 1912 Summer | 20 | Stockholm | Swimming | Men's 100 metres Freestyle | Norway | NOR | 4 h7 r1/4 | ||
| 1912 Summer | 20 | Stockholm | Swimming | Men's 400 metres Freestyle | Norway | NOR | 6 h1 r2/3 | ||
| 1912 Summer | 20 | Stockholm | Swimming | Men's 1,500 metres Freestyle | Norway | NOR | 3 h5 r1/3 | ||
| 1912 Summer | 20 | Stockholm | Swimming | Men's 100 metres Backstroke | Norway | NOR | 4 h4 r1/3 |
| Games | Age | City | Sport | Country | Phase | Unit | Rank | T | |
|---|---|---|---|---|---|---|---|---|---|
| 1912 Summer | 20 | Stockholm | Swimming | Norway | Round One | Heat Seven | 4 | 1:19.1 |
| Games | Age | City | Sport | Country | Phase | Unit | Rank | T | |
|---|---|---|---|---|---|---|---|---|---|
| 1912 Summer | 20 | Stockholm | Swimming | Norway | Semi-Finals | Heat One | 6 | ||
| 1912 Summer | 20 | Stockholm | Swimming | Norway | Round One | Heat Two | 2 | QU | 6:14.4 |
| Games | Age | City | Sport | Country | Phase | Unit | Rank | T | |
|---|---|---|---|---|---|---|---|---|---|
| 1912 Summer | 20 | Stockholm | Swimming | Norway | Round One | Heat Five | 3 | 25:45.6 |
| Games | Age | City | Sport | Country | Phase | Unit | Rank | T | |
|---|---|---|---|---|---|---|---|---|---|
| 1912 Summer | 20 | Stockholm | Swimming | Norway | Round One | Heat Four | 4 | 1:34.2 |