Thorne’s programs are managed and implemented by an experienced staff of nonprofit professionals and environmental educators. Thorne maintains a small year round staff (see names and bios below) and hires more than 20 seasonal instructors for its camp each summer. CLICK HERE if you are interested in joining the Thorne team, and CLICK HERE to download Thorne’s organizational chart.


Stephanie Brudwick
Administrative Director
p. 303.499.3647 x 100
CLICK HERE to email Stephanie

Stephanie joined the Thorne team in 2004 and returned from a 2-year hiatus in 2014.  She has a B.A. in Environmental Studies from the University of Colorado at Boulder.  Stephanie coordinates the administrative office duties, managed individual donors, and coordinates registrations for Thorne Summer Camp. After serving as Thorne’s Administrative Director for 10 years, Stephanie has an intimate knowledge of organizational management.  She is conversant in Spanish.

Keith Desrosiers
Executive Director
p. 303.499.3647 x 105
CLICK HERE to email Keith

Keith joined the Thorne team in 2010 and has a B.A. in Government from Skidmore College and a M.A. in Public Administration from the Rockefeller College. Keith has served as an Executive Director, Development Director or Nonprofit Consultant for Colorado environmental nonprofits since 1997. Keith has extensive knowledge and experience in the areas of strategic planning, fundraising, operational efficiency, and board development.

Aly Valley of the Giants

Alyson Duffey
Director of Development & Marketing
p. 303.499.3647 x 108
CLICK HERE to email Aly

Aly started at Thorne back in January 2003 when she was studying for her M.A. in Environmental Leadership at Naropa University and soon became the Director of what was then called the Thorne Natural Science School. Aly created many classes that are still offered today in Thorne’s popular Summer Camp. Aly grew up exploring the deciduous forests, fields and beaches of Lake Erie in Western New York and obtained her B.A. in Environmental Studies from SUNY at Buffalo. After serving as an Executive Director, Associate Director or Development Director for various Colorado environmental nonprofits, Aly returns to Thorne in 2016 with knowledge and experience in the areas of special events, fundraising, outreach and nonprofit management.


Carlos Lerma
p. 303.499.3647 x 111
CLICK HERE to email Carlos

Carlos Lerma joined the Thorne team in 2015, he has a Bachelor of Science in Biology from Northern Arizona University. Carlos has experience working in the field of conservation biology and community outreach. He has worked in fisheries and avian research as well as engaging Latino communities in conservation and outdoor education. Carlos joined Thorne as a contributing member to the GOCO Inspire Initiative project, Nature Kids/Jovenes de la Naturaleza, and will be working closely with the communities involved in that program.

Mikaela Madalinski
Lead Educator
p. 303-499-3647 x 109
CLICK HERE to email Mikaela

Mikaela joined the Thorne team as an AmeriCorps member in 2012. After completing her Elementary teaching license, she is back for more! Mikaela also has a B.A. in Environmental Studies from the University of Colorado at Boulder. She has been living in Boulder for several years now, volunteering, helping to design curriculum, and doing science education all over the Boulder-Denver area.

Andy Maeding
School Program Manager
p. 303-499-3647 x 107
CLICK HERE to email Andy

Anthony “Andy” Maeding  joined the Thorne team in 2016. He graduated with a B.S. in Recreation Resources Management from Colorado State University and more recently earned a Montessori Lower Elementary Teaching Credential from Montessori Education Center of the Rockies. Over the past seven years he has dedicated his efforts into Montessori/Environmental program development providing hands on natural science lessons, permaculture design, animal husbandry projects, and wilderness exploration to students in a both private and public school settings. He enjoys blending outdoor learning with the work in their classrooms. He has extensive experience cultivating nature connection with children of all ages, having led students on extended wilderness expeditions, sea kayaking, snorkeling, scuba diving, backcountry skiing, fly fishing and international travel experiences.

Angela Meyers

Angela Myers
Program Manager – Curriculum & Inclusiveness
p. 303.499.3647 x 102
CLICK HERE to email Angela

Angela joined the Thorne team in 2013 and has a B.A. in Geology from the University of Colorado at Boulder and an M.A. in Curriculum and Instruction from the University of Colorado at Denver. She has six years experience as a bilingual classroom teacher in the Denver Public Schools, infusing experiential learning into curriculum as her school’s Science leader. Angela also served as a Peace Corps environmental volunteer in Peru where she gained advanced proficiency in Spanish.

Carrie Profile






Carrie Riesberg
Summer Camp Coordinator
p. 303.499.3647 x 110
CLICK HERE to email Carrie

Carrie Riesberg joined the Thorne team as the Summer Camp Coordinator in 2016 after working in the Thorne Summer Camp program for six years. She has a BS in Business Administration and Entrepreneurship from the University of Colorado at Boulder and has extensive training in special education and school-based mental health services. Carrie has eight years of experience as a behavioral specialist and paraeducator in elementary special education and as an after-school enrichment teacher. Carrie believes strongly in nature’s power to bring joy and connection to people of all ages.

Erin Saunders

Education Programs Director
p. 303.499.3647 x 101
CLICK HERE to email Erin

Erin joined the Thorne team in 2004 and has a B.S. in Zoology and Botany from the University of Washington. Erin has created curricula for many Thorne programs, written grants, and worked exhaustively with teachers, science coordinators, and district administrators as well as parents to ensure quality nature science programming for our community. Erin is a certified Project Wild facilitator and is conversant in Spanish.

Gwen Tenney
Program Manager – Field Trip & Volunteers
p. 303.499.3647 x 103
CLICK HERE to email Gwen

Gwen joined the Thorne team in 2010 as a Summer Camp Instructor and has a M.S. in Ecology from the University of Toledo and a B.A. in Environmental Studies from Lake Forest College. Gwen has served as an educator, coordinator, and conservationist with organizations like the Butterfly Pavillion, the Len Foote Hike Inn, and Joshua Tree National Park. Gwen is a published author and certified Project Wild facilitator.

Dr. Oakleigh Thorne II
Founder, Honorary President, & Bird Banding Instructor
p. 303.499.3647 x 104
CLICK HERE to e-mail Oak
CLICK HERE to read Oak’s History


Kara Wadenstierna
303.499.3647 x 107
CLICK HERE to e-mail Kara

Kara joined the Thorne team for summer camp and is thrilled to spend the fall season here as well. She has a B.A. in Elementary Education from Wheaton College (IL). Kara brings to Thorne two years of primary teaching experience in Colorado’s Front Range, a year of educational non-profit work, and many summers working in and volunteering for Yellowstone National Park and Rocky Mountain National Park. Kara strongly believes that stewards of public lands are created first through joyful experiences and education within them, and is so elated to continue connecting kids to nature. When she is not teaching, Kara enjoys trail running, hiking, painting, and reading.