Zach Bitter is a multi-world and USATF record holder. He specializes in the 100-mile distance. Originally from Wisconsin, Zach now resides in the Phoenix area with his wife and elite ultra runner Nicole Bitter.
- USA 100 Mile Track Record 11 hrs 40 min 55 sec
- World Record 12 Hour Track 101.66 Miles
- World Record 100 Mile Trail Running 12:08:36 2018 Tunnel Hill Ultramarathon