GNFAC Staff Forecasters

Doug Chabot

Doug, director of the Gallatin National Forest Avalanche Center, received his B.A. in Outdoor Education from Prescott College in 1986. From 1990 to 1999 he worked as a professional ski patroller at Bridger Bowl Ski Area in Bozeman, Montana. Starting in 1995 Doug has worked for the GNFAC as an avalanche specialist. He's also a mountain guide and climber. Doug has been on numerous climbing expeditions to Alaska, Nepal, India, Afghanistan, Tajikistan and Pakistan, resulting in many first ascents and new routes. In 2011, Doug co-founded Iqra Fund, a nonprofit doing education work for girls in northern Pakistan (

Eric Knoff

Eric has worked as a full time forecaster for the Gallatin National Forest Avalanche Center since 2009. He attended MSU and graduated in 2000 with a degree in physical geography. Post graduation, Eric worked with the NRCS in Bozeman as a Cartographic Technician. In 2002 Eric moved to Utah and became a professional ski patroller at Snowbird Ski and Summer Resort, where he patrolled for the next six winters. In addition, Eric served as an avalanche forecaster for the Going-to-the Sun Road in Glacier National Park from 2011 to 2014. Aside from avalanche forecasting, Eric has been a professional guide for Exum Mountain Guides, Rainier Mountaineering Inc., and Mountain Link. He has guided trips from Alaska to South America and has been a two-time instructor for the Khumbu Climbing School in Phortse, Nepal. Recently, Eric traded the mountains for rivers and is now a fly fishing guide on the blue ribbon trout streams of southwest Montana during the summer months.

Alex Marienthal

Alex Marienthal joined the GNFAC forecasting team in the 2015-16 season. Alex worked for the Friends of the Avalanche Center as an avalanche educator for the previous five years with the last two as Education Coordinator. He also ski patrolled at Bridger Bowl for the five winters. Alex earned his masters degree in snow science from MSU in 2014. The focus of his Master’s thesis was forecasting deep slab avalanches on persistent weak layers Alex grew up skiing and navigating the mountains of Colorado and has skied off mountaintops throughout the intermountain west, Sierra Nevada, Chugach, and Canadian Rockies.

Ian Hoyer

Ian started with the GNFAC in the 2018-19 season after cutting his teeth forecasting at the Colorado Avalanche Information Center where he spent three seasons as a backcountry forecaster based in Leadville. Prior to his time at the CAIC, he earned his MS from Montana State University with a focus on snow science. His other avalanche experience includes a season interning with the GNFAC, Ski Patrolling at the Yellowstone Club and teaching a range of avalanche courses.