Diana Madson

Founder & Executive Director


Growing up in Northern California, Diana Madson spent much of her life in the great mountains of the Sierra Nevada. Devoting her education and career to protecting these pristine landscapes and vibrant communities, Diana is driven to catalyze change where it counts.

The Mountain Pact developed from Diana’s graduate research at the Yale School of Forestry & Environmental Studies, where she explored how climate change has transformed mountain resort communities. Over the course of her research, including interviews with local governments, businesses and nonprofit groups, Diana identified essential gaps in knowledge and obstacles preventing action. Diana has built the Mountain Pact specifically to overcome these obstacles. 

In addition to her work with the Mountain Pact, Diana is Sierra Business Council's Government Affairs Director as well as the Director of the Sierra Climate Adaptation & Mitigation Partnership (Sierra CAMP) where she advocates for investments in the Sierra Nevada region to support triple bottom line initiatives such as climate action, mitigation and adaptation efforts, sustainable communities strategies, conservation, community planning, and economic development. 

Prior to the Mountain Pact, Diana was the Founder and Director of Yale University’s Team Climate, a climate change media campaign that partnered with 16 Olympians at Sochi to reach over 315 million people with the message that climate change is compromising winter sports. Diana has also worked for the Climate Registry where she consulted over 400 corporate and government clients on greenhouse gas accounting.

Diana received her Master of Environmental Management from the Yale School of Forestry & Environmental Studies and graduated with Highest Distinction from the University of California, Berkeley with a B.S. in Society & Environment and a B.A. in Rhetoric.

Maddie Rehn

Senior Project Director


Maddie was born and raised in the Colorado Rockies. Her backyard was the White River National Forest. With twelve ski resorts, eight wilderness areas, and endless miles of trails, it was easy for Maddie to gain a deep appreciation for alpine environments and mountain communities. Seeing firsthand the changes of climate at high altitude, she has been dedicated to the informed stewardship of the earth and improved management approaches vital to cultivating sustainable mountain communities.

Maddie joined the Mountain Pact in 2015 and has been providing policy research and mobilizing support to Mountain Pact delegations since. She received a Master in Environmental Management degree from Western State Colorado University. 

Not only is she motivated by her love of the outdoors, but also by the community of people who live amongst the mountains. 


Project Director

Jocelyn grew up exploring the mountains of Southwest Colorado where her love and appreciation for open spaces and public lands began to develop at a young age. She has always been deeply drawn to the unique communities and ample opportunities for recreation that Colorado mountain towns have to offer. It was while Jocelyn was working as a field instructor for the Colorado Outward Bound School (COBS) that her passion for protecting the environment was cemented. Seeing the impact that wild places have on the minds of other young people inspired her to seek ways to protect the alpine ecosystems essential to outdoor recreation and the economies of the mountain towns that she calls home.

Her work for COBS inspired Jocelyn to return to college to study Environmental Biology and Ecology and Environmental Studies at Western State Colorado University (WSCU). Through coursework at WSCU Jocelyn has been encouraged to seek ways to make an impact in the national climate conversation. She hopes to find holistic ways to implement the important findings of scientists into working policies and solutions to help reduce the impacts of climate change.

Charlotte Massey


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Charlotte grew up skiing and hiking in the Cascade mountains of Washington state, where she saw the impacts of climate change on her community at an early age. She was raised in Leavenworth, WA, a small mountain town with a tourism-based economy that has gained traction as a popular outdoor recreation destination. Watching glaciers recede in the mountains every summer and experiencing the impact that snowless winters and forest fires had on her town’s economy gave her a tangible sense of the impacts of climate change. This experience pushed her to advocate for better environmental policies in her school and community. 

Charlotte is now junior at Middlebury College where she is studying Philosophy and Religion with a focus on Ethics and Environmental Science. She is president of her college’s debate society and competes on the international circuit, debating policy issues with students from around the world. 

Charlotte is highly motivated to apply her research in discourse and ethical frameworks to environmental activism. She aims to help bridge the gap between environmental research, public understanding, and governmental policy. The impact of climate change on outdoor recreation communities is an issue close to her heart, and she is excited to help communities advocate for policies that protect our recreation industries and our planet.