Wildlife Expeditions

Journey to the Wild

Guides & Staff

  • Joe Petrick

    Vice President of Field Education
    M.Ed., University of Washington
    Certificate in Education, Environment and Community, Islandwood Graduate Program
    B.A., History and a Virginia Professional Teaching Certificate, University of Mary Washington


    Joe leads a team of passionate educators who customize field science adventures for groups of all ages. He joined the Teton Science Schools family in the spring of 2007. Prior to Teton Science Schools, Joe worked as an administrator, classroom teacher and outdoor educator in Washington, California, Virginia, Maryland and South Africa. Joe spends his free time exploring the Greater Yellowstone Ecosystem and traveling to other inspiring locations.

  • Patrick Leary

    Director of Wildlife Expeditions
    B.A. Anthropology/Archaeology, Willamette University, Oregon

    Patrick joined Teton Science Schools in 2013. Prior to arriving at TSS, Patrick worked as an environmental education instructor and as an assistant director for the outdoor education program at YMCA Camp Colman in Washington. He has also worked as a coordinator for a teen volunteer program in Missoula, Montana, as a seasonal employee of the United States Forest Service and as a backpacking guide in Guatemala. During his time as a member of the TSS community, Patrick has served as an AmeriCorps intern with the Field Education department, as a field instructor and faculty member and as a biologist with Wildlife Expeditions.

  • Chrissy Wolf

    Administrative Assistant
    B.S. Recreation Management and Policy, Program Administration
    B.S. EcoGastronomy


    Chrissy joined the Teton Science Schools team in 2014, after moving from rural New Hampshire. She has worked for the organization in many capacities, as a field education AmeriCorps member, as a program assistant for day camp, and as the summer program director at Teton Valley Community School. She is thrilled to now be a part of the Wildlife Expeditions team. In her free time, she enjoys mountain biking, telemark skiing, cooking, gardening and music.

  •  Kevin Taylor

     Wildlife Expeditions Lead Guide and Faculty
     M.S. Botany, University of Wyoming
     B.S. Biology, Bradley University, Illinois

    Kevin has a Bachelor of Science degree and a Master of Science degree in Botany. His biological research experience includes being involved with several wildlife research projects as well as mapping distribution of rare plant species and the effects of global warming on mountain plants. He believes that it is critical to include modern humans when discussing natural history and ecology and he studies and teaches ethnobotany and ethnozoology. Kevin brings to Wildlife Expeditions experience in plant taxonomy, natural history knowledge due to spending a lot of time in the woods, and a teaching background educating all ages of the wonders and value of conservation of the natural world.

  •  Paul Brown

     Wildlife Expeditions Lead Guide and Faculty
     B.A., Environmental Studies, Ramapo College, New Jersey

    After graduating from Ramapo College, Paul worked for the U.S. Forest Service and New Jersey Audubon. He relocated to Jackson Hole in the spring of 2001 and has led a variety of environmental education programs, primarily guiding in the Greater Yellowstone Geo-ecosystem for Wildlife Expeditions. He has worked on several research projects in the area, including studying the wolf population of Yellowstone National Park with the Yellowstone Wolf Project. He has also guided polar bear expeditions in Churchill, Manitoba.

  • Dylan Klinesteker

    Lead Snowcoach Guide and Faculty
    B.A. Environmental Education: Interpretation and Outdoor Education, Western Washington University

    Dylan has spent most of his professional life working and living in some of the most beautiful and inspiring places in America. He has had the opportunity to educate visitors in Death Valley National Park, Redwood National and State Parks, North Cascades National Park, and now finds himself in Grand Teton and Yellowstone National Parks. In his free time, Dylan likes to ride one of his many bikes, keep his '88 Westfalia running, and take pictures of this beautiful world.

  •  Sarah Ernst

     Lead Guide
     B.A., Philosophy, Mount Holyoke College, Massachusetts

    Sarah grew up fascinated by nature in the not-so-wild lands of a NYC suburb in Connecticut. After earning a Bachelor of Arts degree, she transitioned to leading nature programs and running a nature center in the beautiful Lowcountry of South Carolina. She was lured to Wyoming by a life-long love of it's mountains and plains. She is known for her broad knowledge base of the Greater Yellowstone Ecosystem and geeky enthusiasm for all wildlife, large and small.

  •  Heidi Helling

     B.S. Ecology and Conservation Biology, University of Idaho

    Heidi recently worked as a wildlife biologist with USFWS in Alaska, where she focused on mapping the spatial temporal characteristics of snow in Arctic National Wildlife Refuge. Heidi has completed large-scale snow machine expeditions in the arctic to achieve these goals. Prior to this experience, Heidi worked seasonally in Yellowstone and Grand Teton National Parks, focusing on winter ecology studies.

  •  Jeff Mulligan

     B.S. Wildlife Conservation, University of Massachusetts

    Before moving to Jackson in 2015, Jeff worked for the Massachusetts Department of Conservation and Recreation, Department of Energy and National Park Service in Boston. Over the past four winters, Jeff has worked at TSS in a variety of positions in the field education branch. He spends his summers as a park ranger in Grand Teton National Park and also volunteers with the park in the winter, assisting with wildlife research. In his free time Jeff enjoys fly fishing, hiking, skiing, and wildlife photography.

  •  Trevor LaClair

     B.S. Fisheries and Wildlife, University of Missouri

    Originally a small town, farm boy from Missouri's Ozarks, Trevor has developed a lifelong passion for wildlife and adventure. While working toward his M.A. in Biology, Trevor has traveled to places such as the African Serengeti, Great Barrier Reef and Komodo National Park. He's worked with animals in multiple zoos and sanctuaries and is skilled in a variety of outdoor activities. Aside from guiding, Trevor also enjoys wildlife filmmaking and photography, developing his portfolio which can be viewed at trekkingwithtrevor.com.

  •  David Stinson

     Commercial Airplane and Helicopter Pilot

    David is a Wyoming native with more than a decade of experience flying to do wildlife research in the Greater Yellowstone Ecosystem. David spends his free time in the mountains trying to keep up with his wife and two boys. 

  • Kate Jensen
    B.S. Environmental Studies, University of Utah

    Kate spent several years guiding rivers in Utah and Alaska and also worked for the Forest Service doing field research. Katie is raising three daughters and taking them into the wild places of of the GYE, Utah and other beautiful places around the world. Kate grew up spending summers in Teton Valley, Idaho, and has always had a love for and curiosity of the area. Kate enjoys spending time with her family and any activity that gets her outside and into places that are beautiful and wild, making art, cooking and reading. 

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