Guide Bios

When you join a Yosemite Conservancy Outdoor Adventures program, you will have quality time in the field with some of the most knowledgeable and talented naturalists, historians and artists in Yosemite. Collectively, they’ve hiked tens of thousands of miles in the park, won numerous awards, authored dozens of books, and had their art or photographs published around the world. Our guides are excited to share their passion for Yosemite with you.

Allison Baggett, Yosemite Conservancy expert guide

Allison Baggett

Allison Baggett grew up in a small town at the entrance to Yosemite. She has backpacked from Mt. Whitney to Canada on the Pacific Crest Trail and from Portland, Oregon, to Missoula, Montana, following the route of Lewis and Clark. Allison has worked as a teacher, naturalist, mountain guide and artist since graduating from The Evergreen State College in Olympia, Washington. She has been trained as a Wilderness Emergency Medical Technician and currently holds a Wilderness First Responder certificate.

Experienced naturalist guide Art Baggett

Art Baggett

Art Baggett was a winter guide for Yosemite Mountaineering School and past faculty of the UC Sierra Institute. He has done numerous trans-Sierra winter trips, skied the John Muir Trail three times, and once skied from Yosemite to Tahoe.

Kylie Chappell, Yosemite Conservancy expert guide

Kylie Chappell

Kylie Chappell grew up in the Yosemite gateway, Mariposa. She has always enjoyed a love for the outdoors including rock climbing, backpacking, skiing and swimming. After traveling abroad to New Zealand, Australia and China she couldn’t wait to return to her roots and settle in Yosemite. She has worked as a horseback riding guide and packer in Yosemite for three years. As the Outdoor Adventure Coordinator for Yosemite Conservancy, Kylie is able to share her love and knowledge of Yosemite with visitors from all over the world.

Les Chow, Yosemite Conservancy Guide

Les Chow

Les Chow came to Yosemite in 1986 to study the newly reintroduced Sierra Nevada bighorn sheep in Lee Vining Canyon. Working with Peggy Moore, he documented the births, deaths, movements, and habitat use by the relocated herd. Using data from the project for their theses, Les and Peggy earned MS degrees in 1991 from the UC Berkeley. Prior to his arrival in Yosemite, Les worked in Sequoia and Kings Canyon National Parks studying black bears, and in Hawaii Volcanoes National Park studying feral pigs.

Pete Devine, Yosemite Conservancy expert guide

Pete Devine

Pete Devine has taught outdoors in Yosemite for 30 years and is the now the Yosemite Conservancy’s Resident Naturalist. Originally from New England, Pete has worked in the West as a park ranger, archeologist, river guide, naturalist and teacher. He has hiked the Alps, Andes, Himalaya, Min Shan and Southern Alps, and has a bird list that includes motmots, minivets, drongos and the plain-mantled tit spinetail. Pete has been studying the recession of Yosemite’s Lyell Glacier for twenty years, and he serves as a Yosemite Expert for National Geographic Expeditions. 

Dick Ewart, Yosemite Conservancy expert guide

Dick Ewart

Dick Ewart a veteran hiker and skier, has been a ranger-naturalist in Yosemite for over thirty years. He has hiked most of the park’s 800 miles of trails. His BA degree in biol­ogy is from the University of New Hampshire and his New England accent is as strong as ever. Dick spends his summers presenting naturalist programs at Glacier Point, and his winters leading snowshoe hikes at the Yosemite Ski & Snowboard Area.

Stephanie Eyes, Yosemite Wildlife Biologist

Stephanie Eyes

Stephanie Eyes is a wildlife biologist in Yosemite, overseeing the park's owl- and carnivore-monitoring programs. She has been a National Park Service employee since 2014 and previously worked in Yosemite for the US Geological Survey. Eyes received her M.S. degree from Humboldt State University studying the effects of fire severity on Yosemite’s spotted owls. While finishing her Master’s, Stephanie worked for the US Forest Service monitoring the Pacific fisher population south of the park.

James Corwin Johnson

James Corwin Johnson

James Corwin Johnson has specialized in professional photography for over 35 years. He is a graduate of the Glen Fishback School of Photography, and is currently on the faculty of the Ringling School of Art and Design, Longboat Key Center for the Arts and Photo Experience Education. James has taught in many institutions, including: Eckerd College, Anna Maria Island Art League, Safari Education, Yosemite National Park, Ansel Adams Gallery, Walt Disney World and Disney Cruise Line. James shares his vast experience out of his home base, Photo Experience, located in Sarasota Florida.

Yosemite Conservancy Guide Ryan Kelly

Ryan Kelly

Ryan Kelly has been guiding adventures in Yosemite National Park for the last five years. His work for the Yosemite Conservancy and NatureBridge helps visitors develop a sense of place through ecology, human history and adventure. Ryan is pursuing a masters degree in Environmental Management through Western State Colorado University, and looks forward to engaging with participants about their vision for Yosemite's future.

Lisa Murphy, Yosemite National Park ranger and Yosemite Conservancy Guide

Lisa Murphy

Lisa Murphy has spent her lifetime getting to know Yosemite National Park, beginning with family trips to the park as an infant and culminating in her career as naturalist ranger. Her love for the environment and for Yosemite National Park is apparent and infectious. Lisa has been living and working in the park for over twenty years, and continues to explore it with insatiable curiosity, always looking for new experiences and new things to learn and share with visitors and fellow park enthusiasts.

Karyn "Kestrel" O'Hearn

Karyn "Kestrel" O'Hearn

Karyn "Kestrel" O'Hearn has spent over 20 years studying and sharing California's Natural History. She graduated in 1996 from UC Santa Cruz with a Environmental Studies degree, and after two short seasons with Cal Fire began teaching in environmental education which led her to the Sierra. She has been a Ranger Naturalist interpreting, teaching, and guiding visitors throughout Yosemite National Park including a field trip each June as part of the Mono Basin Bird Chautauqua and leading High Sierra Loop trips since the early 2000's.

Julia Parker, Yosemite Conservancy expert guide and basket weaver

Julia Parker

Julia Parker has lived and worked in Yosemite for over fifty years where she is the park’s longest-tenured employee. As a “living legend”, Julia has dedicated her life to preserving and communicating traditional American Indian cultural history, inspiring visitors to be responsible environmental stewards. She has studied under master weavers and currently demonstrates basket weaving techniques at the Yosemite Museum. Her handiwork is highly sought after and several of her baskets are displayed in prominent museums and collections all over the world.

Lucy Parker, Yosemite Conservancy expert guide and basket weaver

Lucy Parker

Lucy Parker is descended from a long line of Yosemite cultural interpreters. Brought up in a traditional cradle basket, Lucy worked in the park as an Indian cultural demonstrator for many seasons. She has also performed living history at Bodie State Park, and demonstrated traditions of the Paiute people at the Lee Vining Visitor Center.

Jen Peach, Yosemite Conservancy Outdoor Adventure

Jenn Peach

Jenn Peach came to Yosemite by way of Southwest Florida, where she spent her childhood swimming and paddling at the swamp and beach. Before arriving in Yosemite, Jenn worked in outdoor education in coastal North Carolina; northwest Washington; Grand Canyon National Park; and northern California. With a M.Ed. in Environmental Education and years of adventuring with others in the natural world,she brings considerable knowledge and a healthy sense of play to her work outdoors!

John Ricca, Yosemite Conservancy expert photography guide

John Ricca

John Ricca is a San Francisco Bay Area professional fine art photographer who uses the camera to capture moods and visual experiences usually associated with other visual art forms. He focuses on natural and close-up images that emphasize shapes, textures, and patterns. He tutors individuals and small groups in photography workshops and field trips on how to improve their photographic techniques. He has exhibited in numerous group and solo exhibitions throughout the Bay Area.

Adonia Ripple

Adonia Ripple

Adonia Ripple has made her home in the mountains since she arrived in Yosemite in time for the flood of 1997. Armed with a backpack full of field guides and a first aid kit, she instructed young people from all walks of life about the natural and human history of the park as an instructor for Nature Bridge. Over time, she shed her trail shoes for practical nonprofit-office footwear. Adonia feels most at home on the side of a mountain, be it on skis, bike or on the end of a climbing rope.

Jim Roche

Jim Roche

JIM ROCHE is a park hydrologist for the Resources and Science Division of Yosemite National Park. He oversees projects to protect water resources, such as lakes, streams and wetlands; conducts scientific research to monitor the effects of climate change and visitor impact on aquatic resources; and informs water supply management. Roche arrived in Yosemite in 2003 and has worked for the National Park Service for more than 16 years. He is pursuing a doctorate in hydrology at UC Merced.

Ken Rockwell, Yosemite Conservancy expert photography guide

Ken Rockwell

Ken Rockwell is a talented photographer and host of a popular website for essays, photo galleries, lessons and equipment reviews. Having fully the embraced digital age, Ken is equally adept with traditional 35mm, panoramic, medium and large format photography. An engineer by training, Ken has an artistic eye and is excited to share his knowledge and opinions about photography.

Micheal Elsohn Ross, Yosemite Conservancy expert guide

Michael Elsohn Ross

Michael Elsohn Ross has led Outdoor and Custom Adventures for Yosemite Conservancy since 1977. He is the award-winning author of 42 books for young people including “Baby Bear Isn't Hungry”, “The Happy Camper Handbook”, “The World of Small”, and “Snug as a Bug”. He teaches children’s book writing workshops and is a popular speaker at schools and conferences around the world. Michael is passionate about sharing Yosemite’s diversity to newcomers and long-time park enthusiasts. He lives with his family near the park in a home overlooking the Merced River.

John Senser, Yosemite Conservancy expert photography guide

John Senser

John Senser is an accomplished landscape and wildlife photographer/writer. His images have appeared in Sierra Club calendars and National Geographic publications and he is regularly featured in Central Sierra Seasons Magazine. He has conducted numerous courses and workshops for organizations including the University of California and Columbia College. As the owner of Yosemite Light Photography, he produces finely crafted photographic prints and notecards that are sold at art shows and galleries around California.

Shirley Spencer, Yosemite Conservancy expert artist instructor

Shirley Spencer

Shirley Spencer is a renowned artist, musician/singer, athlete and educator. She is also the author/illustrator of Yosemite Conservancy’s Flowering Shrubs of Yosemite and the Sierra Nevada and co-author (with her husband Mark) of Southern Yosemite Rock Climbs. Since the 1980s, thousands have been lucky enough to explore Yosemite with Shirley and share her infectious affinity for the outdoors.

Cathy Stewart

Cathy Stewart

Cathy Stewart is a retired Forest and Fire Ecologist from the U.S Forest Service. She fell in love with trees one summer working at Evergreen Lodge, just outside the park and went to study Forest Management at UC Berkeley.  She acquired a Master’s Degree in Forest Ecology from the University of Montana.  One of her favorite trees is Whitebark Pine and she enjoys sharing her passion for trees with others.

Suzanne Swedo, Yosemite Conservancy expert guide

Suzanne Swedo

Suzanne Swedo is the director of W.I.L.D. and has backpacked the mountains of every continent. She has led groups into the backcountry for over 30 years and teaches wilderness survival and natural science for individuals, schools, universities, museums and organizations, including Yosemite Conservancy and the Sierra Club. She has authored numerous books and has appeared on radio and television to share her knowledge of backpacking, botany and wilderness survival.

Naturalist Guide Dan Webster

Dan Webster

Dan's first wilderness job in California was as a forest fire fighter. He now teaches about the role played by fire in forest ecology. These days, he is a Sierra Nevada-based naturalist, birder, hiker, and father of two boys who love being outside. In addition to enjoying and interpreting the wonders of Yosemite, Dan was the director of a summer camp in Western Maine where he led wilderness trips for 23 years. Dan's motto is, "Any day in the mountains is a good day." His guided tours weave together science, wonder and joy for a deeper appreciation of nature.

Dave Wyman, Yosemite Conservancy expert photography guide

Dave Wyman

Dave Wyman is an accomplished photographer and author of three pictorial guidebooks (“Backroads of Northern California”, “Backroads of Southern California”, and “Yosemite in Photographs”). His photographs and articles have appeared in Outdoor Photographer, Outside, Backpacker, Sky and Telescope, and many other publications. He is an experienced guide, leading tours for environmental organizations and museums, in addition to photography tours and workshops through his company, Image Quest. He enjoys sharing his passion for photography and the outdoors.

Glen Young, Yosemite Conservancy expert guide

Glen Young

Glen Young was born in the flatlands of Michigan. After completing a Master’s in Park, Recreation, and Tourism Management in New Zealand, Glen worked as an alpine guide, and in the fields of international, environmental, and outdoor education throughout the United States (including Alaska and Hawaii). He also worked abroad in Canada, Thailand, Laos, Cambodia, Vietnam, Burma, Malaysia, Singapore, Nepal, Australia, New Zealand, Ecuador, and Peru where he led study abroad programs and adventure education activities.