About ESAC

To inform and educate the public on avalanche conditions in the backcountry of the Eastern Sierra Nevada of California.


The Eastern Sierra Avalanche Center has a staff of three full-time forecasters. 
For general information, please email forecasters@esavalanche.org

Josh Feinberg - Lead Forecaster

Josh moved out to the Eastern Sierra for a winter in 2002 to ski patrol and never left.  Discovering and exploring the winter backcountry soon became a passion. He’s had the privilege of being part of the Mammoth Mountain Ski Patrol team for over a dozen years, and it is now his sixth year as part of the Eastern Sierra Avalanche Center’s forecasting team.  He spends summers working for the Forest Service’s Forest Inventory and Analysis program collecting data on forest health all over central California.

Chris Engelhardt - Forecaster

The Eastern Sierra has always been a special place to Chris, he grew up skiing at Mammoth and after college returned to ski patrol at Mammoth for four winters. Chris has also worked a guide/patrol and as the snow safety director at Silverton Mountain in the San Juan Mountains of Colorado, forecasted and guided heli-skiing in the Chugach and Kenai Ranges of Alaska, and guided skiing on Hokkaido, Japan. Chris has worked as a ski/snow professional since 1999 and is experienced with both maritime and continental snowpacks. 

Steve Mace - Forecaster

Steve grew up skiing in Golden, Colorado. He began to venture outside the gates in his mid teens and never looked back.  While attending college in Durango, Colorado, he continued to push his skills and knowledge earning his turns in the San Juan mountains.  He has skied across the globe from Japan to the Himalaya where he helped start a ski school in Gulmarg, Kashmir.  More recently Steve has worked as a ski guide in the Wallowa Mountains of eastern Oregon as well as a member of the Snow Safety department at Mt Hood Meadows.  When Steve isn’t skiing he spends his time guiding raft trips on the Colorado River through the Grand Canyon. 



The Friends of Eastern Sierra Avalanche Center is a 501(c)3 non-profit organization overseen by a volunteer Board of Directors, outlined below.  For general information, please email office@esavalanche.org.

Nate Greenberg - President

Forrest Cross - Vice President

Ann Logan - Secretary

Neil Satterfield - Treasurer

Howie Schwartz

Allan Pietrasanta

Michelle Mather

McKenzie Long

Gabe Taylor


Walter Rosenthal- President in memoriam

Walter Rosenthal was the Snow and Avalanche Analyst for Mammoth Mountain, a remote sensing expert for the U.S. Army Cold Regions Research and Engineering Laboratory and a researcher at the Institute of Computational Earth System Science, University of California, Santa Barbara. He specialized in remote sensing of snow and snowpack processes related to sintering and avalanches. As a private consultant he provided operational subresolution snow mapping algorithms and programs to the U.S. Army Cold Regions Research and Engineering Laboratory from 1995 through 2002. Both the Army and the National Weather Service’s National Operational Hydrologic Remote Sensing Center employ his algorithms and are expanding their use to daily operational snow cover maps over North America.

Walter tragically lost his life while trying to save the lives of others in 2006. He was a vital force in the development of ESAC and is dearly missed.

-- placeholder --

ESAC receives significant financial support from ...