| Jeff Nielsen's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| The Bear 100 2014 | Utah, US | 52 | Friday, September 26, 2014 | DNF |
| Hardrock 100 2008 | Utah, US | 46 | Friday, July 11, 2008 | 44:36:10.00 |
| Jeff Nielsen's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| The Bear 100 2014 | Utah, US | 52 | Friday, September 26, 2014 | DNF |
| Hardrock 100 2008 | Utah, US | 46 | Friday, July 11, 2008 | 44:36:10.00 |