Our Advisory Team


Marty Hoffman, MD, FACSM

Dr. Marty Hoffman is former Professor of Physical Medicine & Rehabilitation at the University of California Davis (retired 2023), former Chief of Physical Medicine & Rehabilitation at the VA Northern California Health Care System (retired 2020), former Director of Research for the Western States Endurance Run (2006-16), former team physician for the US Biathlon Association (1988-95), and Chief Medical Officer for the Ultra Medical Team. He has published over 180 peer-reviewed publications mainly related to applied exercise physiology, focusing on human locomotion, human performance, and exercise-associated hyponatremia. His clinical work has involved cardiac rehabilitation, musculoskeletal medicine, and sports medicine. He has been a Fellow of the American College of Sports Medicine since 1989 and serves on multiple editorial boards. He has been a competitive cross-country skier or distance runner for most of his life and still enjoys exploring his limits… though at a much slower pace than in the past, and often with a fly rod in hand.

Kristin Stuempfle, PhD, FACSM

Dr. Kristin Stuempfle is Chief of Staff and Strategic Advisor to the President, and Professor of Health Sciences at Gettysburg College in Gettysburg, PA. She has been a fellow in the American College of Sports Medicine since 2004. Her research interests include examining the physiological challenges of ultra-endurance running. More specifically, she is interested in hyponatremia, gastrointestinal distress, and the food and fluid needs of ultramarathon runners.



Nick Nudell, MS, MPhil, NRP, FACPE

Nick is a Ph.D. candidate and scholar-practitioner that manages a large research portfolio for a health system in Colorado in collaboration with the University of Colorado and Colorado State University. He has over 23 years of paramedic experience, building equitable and sustainable emergency care systems in rural and remote areas. Nick serves as a peer reviewer for multiple journals and as a Senior Editor of Statistics and Methodology for the International Journal of Paramedicine. Although he is not an exceptionally gifted athlete, that has not stopped him from attempting a number of challenging mountainous 50 and 100-mile races in addition to single and multi-day solo fastpack efforts. He has directed medical operations for more than 50 races (from trail marathons to 200-mile trail races) in North America. He has led a team of more than 100 dedicated volunteers.