Meet Our Yellowstone Guides
We love Yellowstone!
All our Yellowstone guides have many years experience in assisting participants of every age and background in place-based, science-based learning in the world's first National Park. We are adept at helping you feel Yellowstone's essence, not just see it. Our knowledge, experience, passion, and storytelling will leave you with memories of an unrivaled experience and a deeper appreciation for living on a moving, breathing planet!
Ashea Mills,
Owner
Naturalist Guide
Ashea has spent thirty years exploring and sharing the Greater Yellowstone Ecosystem, helping people connect to a wild landscape and to themselves. After obtaining a degree in English Writing Arts and Theater, she found herself in Yellowstone, working seasonally and falling in love with one of the most dynamic landscapes on earth.
She has led all ages and interests through the park as a Yellowstone guide, including children’s programming, driving snow coaches, skiing and hiking deep into the backcountry, geyser gazing and road-based wildlife watching. Since 2020, she has become an expert in Virtual Touring, offering her Yellowstone interpretation in increasingly modern ways while the world adapted.
Ashea is a certified Leave No Trace Trainer and Wilderness First Responder. She is involved in many local and regional organizations pursuing smart growth, wise use of water, and maintaining a Wild Livelihood. Ashea is grateful to raise her daughter in such a wild space. Immersing in Yellowstone's wildness and the surrounding public lands on skis and foot is where they find nourishment.
Barbara Ulrich, M.S.
Naturalist Guide
Barbara is a geologist who has been exploring and studying the Yellowstone ecosystem for the past 25 years. Originally from Connecticut, she moved to Gardiner, Montana after retiring from her career as an environmental geologist with the State of Colorado. Her passion for Yellowstone originated from her interest in wolf reintroduction.
Barbara has been an instructor for Yellowstone Association, a guide for Xanterra, driving snow coaches and historic yellow buses, and for the past 15 years, a private guide. While in the field, Barbara loves focusing on Yellowstone’s unique geology and its influence on the ecosystem. In 2020, she earned a second master’s degree from Montana State University, where she specialized in paleoecology.
When not working in Yellowstone, Barbara enjoys traveling and has visited the Brazilian Amazon, the Galapagos, Africa, the Arctic, Greenland, and Iceland. France is her favorite destination.
Barbara received her B.A. in geology from Vassar College and her first M.S. in geology from Rutgers University.
Barbara is a Certified Interpretive Guide with the National Association for Interpretation. She lives on the Yellowstone River with her dog, Beau.
"I can’t stop thinking about Yellowstone and how important it is that we care for our Earth."
Carly, age 8
Rhiana Peck
Naturalist Guide
Rhiana grew up on the northern edge of Yellowstone Park, where she thrived on being an active outdoors woman with the mountains and rivers of the Greater Yellowstone Ecosystem as a backdrop.
For the past decade, she has studied and lived abroad in India and Turkey, earning a degree in Sociology and Anthropology from Earlham College in Indiana. Her interest in history and the human experience lends to sharing the unique story Yellowstone tells with visitors from around the world.
After relocating back to the northern edge of the park in 2020, Rhiana is excited for the opportunity to immerse herself in her home dirt, and share her voice connecting the human story to a wild landscape. Winter finds her driving a snowcoach in Yellowstone’s interior based at Old Faithful, interpreting the landscape for a wide variety of travelers. Summer finds her based in Gardiner with the Walking Shadow Ecology team, presenting the stories of Yellowstone through the lens of geology, wildlife, and the human connection.
Rhiana is a Certified Interpretive Guide (CIG) with the National Association for Interpretation (NAI) and is a Wilderness First Responder.
My life has been changed by this incredible experience. I have a deeper awareness of the awesomeness of nature.
Reggie D.
Thank you for a most sincere, and now deeper, appreciation for the journey, wildlife, the living Earth, and what brings us home to ourselves.
Leon A.
Walking Shadow is a business devoted to advancing knowledge of Yellowstone National park through highly experienced guides.
Christine D.
