Our Faculty

Kimery Duda, Founder and Executive Director

Kimery’s base camp is Austin, Texas – but, she’ll be the first to tell you that her home is where her heart is – and, that is, in the field. Her passion for adventure was ignited in 1996 by an expedition set out to climb the highest peak in Mexico, Pico de Orizaba. She was taken under the wings of a Mexican family who exposed her to some of the most pristine cultural, historical, and natural sanctuaries throughout Mexico.

Since then, Kimery continues to create and provide opportunities which embrace the ethos of the expedition – through adventure and education in a sustainable way. Kimery has traveled, climbed, surfed, and skied extensively on an international scope. Since 1995, she has professionally guided students, adults, and families in Southeast Alaska, Hawaii, Mexico, Costa Rica, Nicaragua, and to local, state, and national parks in the United States. She has safeguarded over 1500 special events – including USAT; USARA; WFDF; and NICA sanctioned events. Whether on the water, single track mountain bike terrain, or open water swims, Kimery and her team has helped prevent injuries and save many lives in their community as a first response medical team. Kimery and the staff of The Expedition School look forward to sharing and exchanging their knowledge, skills, and wisdom with you in the field.

  • Current Residence: Austin, Texas
  • Years of Guide Experience: 22
  • Years of Teaching Experience: 22
  • Skills: Teambuilding, surfing, mountaineering, photography, sea kayaking, and writing
  • AEMT

Dr. Mark Ackrell, Medical Director

Mark was born in 1965 in Honolulu, HI to parents with a bad case of wanderlust. He has been traveling ever since (50+ countries and counting). While growing up in Leicester, England and San Francisco, most of his athletic endeavors revolved around playing soccer. Since completing his residency in Emergency Medicine he has utilized his skills while working, traveling and playing throughout the world. He has been medical back up for climbing expeditions through South America and Africa. He is a team physician for both for Florida’s federal disaster medical assistance team (DMAT-FL4) as well as the state relief team (SRT-1) and has worked most of the recent hurricanes. He continues to be a clinical instructor for Univ. of Florida and is involved with NASA as a shuttle launch physician.


  • B.A. Physiology, Univ. of Ca, Berkeley
  • B.A. Biochemistry with minor in Mol. Biology, Univ. of Ca. Berkeley
  • M.D. University of Pittsburgh
  • Residency in Int Med & Emergency Medicine, Univ. of Florida, Jacksonville.


  • Medical Director, Emergency Dept, South Austin Hospital
  • Clinical Instructor, Dept of Emergency Medicine, Univ. of Fl
  • Assoc. Director, Office of the Medical Director, Austin/Travis County EMS
  • Medical Director, The Expedition School, Austin Tx
  • Medical Director, Motorcycle Special Events Team , Austin Tx.
  • Team Physician: DMAT-FL 4
  • Team Physician: Fl SRT-1
  • Team Physician: Univ of Fl/NASA shuttle launch team
  • Certifications: FACEP, ATLS, ACLS, PALS, AHLS, AWLS, Hyperbaric Medicine, CCATT, ABLS
  • Current Residence: Austin, Texas
  • Years in the Field: 16
  • Skills: austere environment/pre-hospital medicine, scuba diving

Sharon Barclay

  • RN, AAS Paramedicine
  • ACLS, BLS, WFA, AWLS Instructor
  • Experienced backpacking, orienteering, canoeing guide

Cali Chidester

Texas-born and raised, Cali has a true passion for the outdoors, from exploring National Parks with family and friends to adding plants to her apartment balcony collection. She holds a BS in Environmental Science and Public Policy as well as an EMT-Basic certification. Through her work with the Expedition School, Cali is able to combine her long-standing love of the outdoors with a newfound passion for the medical field. Off the clock, you can find Cali volunteering with Travis County Search and Rescue, hiking or rock climbing in the Barton Creek Greenbelt, or baking some cookies under the close supervision of her dog, Disco.

Natasha Clark, Business Assistant

Natasha grew up minutes from the Adirondack Mountains in New York State. While in college, she went on a life changing study abroad trip to Tanzania and was lucky enough to discover the most beautiful sights, including the Serengeti National Park! After graduating, she is focusing on education. The Expedition School allows her to delve deeper into her passions – outdoors and education!

Kevin Coles

Kevin has been enjoying high adventure as a Boy Scout since the early 1990s, eventually earning rank of Eagle Scout and Life Guard BSA. He then went straight to studying emergency medicine and became an EMT-I (AEMT). After relocating to the Austin area in 2000, he became a professional Fire Fighter/ Engineer/ Educator. Off the clock you will find Kevin hanging out with his kids outdoors, hiking, camping, sailing or wood working. He also still remains active in Scouting as a leader in his son’s Cub Scout pack.

Michael Eason

Michael lives in the desert mountains of West Texas, a place he has called home since 2009. As a child growing up in Central Texas, most of his time was spent outdoors – camping, hiking, boating, fishing and hunting. A firm respect and curiosity of the natural world was instilled in him by his parents. This natural curiosity led him towards botany as a career. During his time with the Lady Bird Johnson Wildflower Center, he headed projects in Texas such as the Millennium Seed Bank Project, Ferns of the Trans-Pecos, and the Vegetation Survey of Big Bend National Park. As a freelance botanist, he has performed numerous vegetation and rare plant surveys throughout Texas and in northern Mexico. Additionally, Michael heads the Rare Plant Conservation and Research department at the San Antonio Botanical Garden and he is on the state board of the Native Plant Society of Texas and the Chihuahuan Desert Research Institute. His first book, Wildflowers of Texas, was released in April of 2018, with two book projects currently underway.

Maddie Hamill

Born and raised in Austin, Texas, Maddie’s love for the outdoors stems from a childhood full of exploring the Barton Creek Greenbelt, spending warm weekends on Lake Travis and attending camp every summer. Her passion for recreation grew in college as she worked for Texas State University Campus Recreation in both the Aquatics and Outdoor program areas. She received her BS in Recreation Administration from TXST in August 2018 and has been guiding with The Expedition School since! When she’s off the clock, you can find Maddie somewhere outdoors, in the sunshine!

Bill Hanson

Bill spent a decade as a wilderness educator, rock-climbing guide, paddling guide and program director for Outward Bound. He has experience leading remote expeditions for groups ranging from juvenile justice offenders to corporate executives. Bill is also a Flight Paramedic and has worked in EMS since 1989. He began his career in pre-hospital medicine as a combat medic for the US Army. Since then he has worked urban EMS in Boston and rural EMS in Vermont, Oregon, and Colorado as well as on a professional ski patrol, and as a Flight Paramedic on the Navajo reservation in Arizona. Currently he works as a Helicopter Rescue Specialist and Crew Chief for Travis County STAR Flight in Austin, Tx. In his spare time he rock-climbs, paddles, scuba dives, and trains for triathlons.

Lynne Lingo

After spending 20 years as a CPA in public accounting, I turned to anything and everything outdoors spending the next 20 years as a paramedic/fire fighter/instructor and now adding nursing to my unusual journey. As a 3rd generation Texan my hobbies include travel, camping, hiking, horses, water activities, and anything else that comes my way. I was fortunate to raise my sons in the outdoors experiencing miles and miles of Texas adventure traveling on horseback. I am now privileged to be introducing my six grandchildren to the same extraordinary experiences cultivating their love of the outdoors and the rich history of our State and Country.


  • BBA Accounting with minor in Business, Southwestern University, Georgetown, Tx
  • AD Nursing, Austin Community College, Austin, Tx
  • BS Nursing, University of Texas at Arlington, Arlington, Tx
  • Assistant Director, Paramedic/RN, The Expedition School
  • Registered Nurse, Emergency Department, Baylor Scott & White
  • Licensed Paramedic, City of Burnet for 21 years (Retired from Williamson County EMS)
  • Fire Fighter, City of Burnet
  • ACLS, PALS, BLS, AMLS, BTLS, EPC, WFA, and Red Cross Instructor

Lindsay Robbins

Certifications: ACA Kayak & SUP Instructor, Waterfront Lifeguard, NASP Archery Instructor, First Aid & CPR, Leave No Trace Educator, Level II Challenge Course Practitioner

Lindsay is an avid hiker, biker, and paddler with a fierce love for all things outdoors. Her favorite teaching style includes immersing groups into a thorough team building experience. Off the clock, she can often be found in a hammock in the backcountry.

Bonus Fact: A true naturalist, Lindsay has a fascination with tarantulas and currently keeps 12 in her home.

Adam Shedlosky

Growing up in Albuquerque and Austin, Adam has cultivated his love for the out of doors from his family’s travels. He appreciates the power of adventure to engage both mind and body. As a guide, he comes with an innate gift of connecting community while fostering educational experiences for novice and experienced students alike.

Certifications: American Red Cross LG Instructor, Waterfront LG, WFA, WSI, Small Craft Water Safety, ACA Level 1 SUP & Kayak Instructor, Level II Challenge Course Practitioner

Lydia Sides

Lydia’s passion for outdoor recreation began as a child, while camping and exploring the outdoors with her family. It continued in her time at Texas A&M University, where she pursued a degree in Environmental Studies. She spent three summers as a wilderness backpacking guide, and one managing the ropes course at a camp in the San Juan Mountains of Colorado. She’s also guided overnight paddling trips, rock climbing groups, day hikes, and various other expeditions. Lydia loves leading others in the outdoors because she believes that these experiences can be formative in bringing people to understand who they are, and why the environment is something we should protect. She has been with the Expedition School since August 2019 and also works as the programs assistant for an environmental non-profit in Austin.

Kim Sorensen

Kim has been an Expedition School guide, medic and educator since 2008. American Canoe Association SUP/Kayak Instructor Trainer. American Red Cross Instructor. She enjoys spending time outside camping, paddling, fishing, hiking, taking pictures and painting watercolors!

Elliott Trahan

Elliott Trahan started guiding with the Expedition School as soon as he could legally drive a car. Originally drawn to the job by his lifelong love for the water, he has returned for six summers and counting to further his passion as an outdoor educator alongside an unmatched cast of stellar humans.

With each year, Elliott brings a new set of experiences to his guiding and instructing. After graduating high school, he spent nine months working, teaching, and traveling abroad, hitting 21 countries in South America and Europe by way of trains, busses, and his right thumb. He’s also worked at summer camps and helped lead hiking trips alongside fellow college students in the Appalachian Mountains.

Now, Elliott lives with one foot in Austin and the other in Boston, where he studies American Studies and Environmental Studies at Tufts University and volunteers as an organizer in the Sunrise Movement. Back with the Ex School for Summer 2020, he couldn’t be more stoked to be outside again with a community he’s proud to call his home.

Bonnie Watson

Bonnie grew up in myriad places around the U.S. in a family of artists and outdoor enthusiasts. By 2005, her focus turned entirely to the intensive study of classical ballet at Milwaukee Ballet Academy, which led her to study contemporary dance and composition, receiving a BFA in 2014 from the University of Wisconsin, Milwaukee. Through her love for, and curiosity about movement, she was introduced to yoga, finding it to be a life changing and enlightening practice. In 2016 Bonnie received yoga and meditation teacher certification from the Hari Om Yoga Vidya School in Rishikesh, India and spent time at Sri Bharat Milap Ashram under the teachings and guidance of Swami Ram Kripalu Maharaji. Bonnie also holds a Warriors at Ease: Yoga in the Military certification and is passionate about sharing yoga with all members of our community in any capacity. After spending months backpacking abroad, Bonnie’s love of the outdoors, adventure, and community building led her to return to school at Green Mountain College to earn a BA in wilderness and outdoor therapy. In August 2019, Bonnie moved to Austin to complete her Early Childhood Montessori Education certification and believes in an integrative approach to teaching, encouraging a healthy lifestyle, creativity and expression, treating students as individuals, and sharing knowledge. She is thrilled to be working with the Expedition School where she can bring her eclectic skills and passions to the Greater Austin community.

Kerstin Wiggins, SUP Instructor

An avid stand up paddler, Kerstin has been paddling the Texas waterways for over 5 years. A surfer at heart, she has surfed waves in Texas, California, Costa Rica, Mexico, the Caribbean and Central America. She infuses her love of SUP and surfing and her desire to connect with others in a meaningful way in each interaction she has with students on the water. She faithfully practices her pop ups and sees each new day as an opportunity to practice what surfing and Stand Up Paddling requires… a still mind, healthy body, strong inner core (inside & out), respect for Mother Nature and a sense of wonder and adventure.

When not on the water, Kerstin can be found with a camera in hand photographing the natural landscape, with a pen in hand jotting down bursts of inspiration or with headphones on listening to Led Zeppelin.

Kerstin fully subscribes to the philosophy that you can’t stop the waves, but you can learn SUP or Surf! And you’ll find no better teachers than the extraordinary staff of the Expedition School!

Certifications: Waterfront Lifeguard, CPR/First Aid, Wilderness
First Aid, ACA Certified SUP Instructor, SUPcore™ Instructor

Current Residence: Austin, Texas

Skills: Stand up paddling, surfing, landscape photography, writing,
and smoothie-maker extraordinaire

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