| U20 World Cup 2011 Colombia - Appearances as Referee |  |
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| 02/08/2011 | Brazil | - | Austria | 3:0 | 2 | - | - |
| 05/08/2011 | Uruguay | - | Cameroon | 0:1 | 5 | - | - |
| 10/08/2011 | Spain | - | South Korea | 7:6 pso | 3 | - | - |
| 21/08/2011 | Brazil | - | Portugal | 3:2 aet | 8 | - | - |
| U20 World Cup 2011 Colombia - Appearances as Referee | |
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| 02/08/2011 | Brazil | - | Austria | 3:0 | 2 | - | - |
| 05/08/2011 | Uruguay | - | Cameroon | 0:1 | 5 | - | - |
| 10/08/2011 | Spain | - | South Korea | 7:6 pso | 3 | - | - |
| 21/08/2011 | Brazil | - | Portugal | 3:2 aet | 8 | - | - |
| Complete name: | Mark Geiger |
| Born: | 25/08/1974 |
| Place of birth: |
USA |
| Nationality: |
USA |