John and Vivian Yosemite Guide Service

About Us

Yosemite Guide Service was established to provide high quality nature-based outings to the more common and remote wilderness settings utilizing our unmatched knowledge of the Sierra Nevada and Yosemite. Our focus is on the ecosystem and natural environment that makes Yosemite very unique and extraordinary, developed from an unmatched awareness working for many years as biologists and naturalists in the Sierra Nevada. Combined with an extensive knowledge of the fascinating history of Yosemite and surrounding region, a trip with YGS is intended to create a more personal connection to this amazing environment, and to make each guest feel at home in this spectacular landscape, not just an occasional visitor. A distinctive quality to Yosemite Guide Service is our extensive knowledge and understanding of the natural history and human events that have shaped Yosemite and the surrounding Sierra Nevada. Our extensive insight of the region provides you a very personal experience, accessing the less crowded destinations to create very special trips & outings. By sharing a life-long connection, expertise, and continual discovery of the Sierra Nevada and Yosemite, our goal is to provide you with an increased awareness and appreciation of one of the world’s most beautiful and inspiring places.

Vivian | Manager

Born and raised in the Sierra Nevada mountains of California, Vivian is a local self taught wildlife and landscape artist and massage therapist who loves to “host”. Vivian partners with John in operating Yosemite Guide Service and the lodgings they offer.

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John | Owner, Guide

Owner John Kleinfelter has spent over 30 years living, working, and exploring in the Sierra Nevada. Simply stated, few others can equal the experience and depth of knowledge John has gained as a biologist and naturalist in the Sierra Nevada.

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Meet our Guides

Working for decades as biologists, naturalists, and wilderness instructors in the Sierra Nevada and Yosemite, our guides combine extensive professional knowledge with a friendly, easy going attitude to create extraordinary outings. With inspiring sightseeing tours, day hikes, and distinctive backpacking and adventure camping trips, each trip is individually designed to provide you with an experience you will treasure for years.
Main house lodging

Kirsten | Guide / Manager

Kirsten enjoys hiking and backpacking during the summer, and snowboarding, snowshoeing, and snowmobiling in the winter. In the summer she spends a large amount of time in Yosemite hiking, backpacking, and sharing her extensive knowledge about the natural history, geology, and unique flora and fauna with her guests.

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Tommy | Guide / Manager

Tommy is constantly seeking new ways to challenge himself and those around him. He enjoys spending his time hiking, mountain biking, camping, summer kayaking, and winter snowshoeing and skiing. Tommy is most comfortable, and content, when engaged in outdoor adventures!

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Meet Cedar

This is Cedar, our friendly and proud service dog and companion of Yosemite Guide Service, who loves to assist with our guided hiking trips and adventures.