| Roles | Referee |
|---|---|
| Sex | Male |
| Full name | Mark William•Geiger |
| Used name | Mark•Geiger |
| Born | 25 August 1974 in Beachwood, New Jersey (USA) |
| NOC | United States |
| Games | Sport (Discipline) / Event | NOC / Team | Phase | Unit | Role | As | |
|---|---|---|---|---|---|---|---|
| 2012 Summer Olympics | Football (Football) | USA |
Mark Geiger | ||||
| Football, Men (Olympic) | Match #1 | Brazil — Republic of Korea | 4th Official | ||||
| Football, Men (Olympic) | Match #4 | Japan — Egypt | Referee | ||||
| Football, Men (Olympic) | Match #4 | Great Britain — United Arab Emirates | 4th Official | ||||
| Football, Men (Olympic) | Match #5 | Brazil — New Zealand | 4th Official | ||||
| Football, Men (Olympic) | Match #1 | Japan — Spain | Referee |