| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Mark•Johnston | |
| Used name | Mark•Johnston | |
| Born | 31 August 1979 in St. Catharines, Ontario | |
| Measurements | 196 cm / 85 kg | |
| Affiliations | University of British Columbia Thunderbirds — Vancouver, British Columbia | |
| Pacific Dolphins — Vancouver, British Columbia | ||
| NOC | Canada |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2000 Summer Olympics | Swimming (Aquatics) | Mark Johnston | ||||
| 200 metres Freestyle, Men (Olympic) | 21 | |||||
| 400 metres Freestyle, Men (Olympic) | 21 | |||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | Canada | 7 | ||||
| 2004 Summer Olympics | Swimming (Aquatics) | Mark Johnston | ||||
| 400 metres Freestyle, Men (Olympic) | 22 | |||||
| 4 × 200 metres Freestyle Relay, Men (Olympic) | Canada | 5 |