Our staff is a team of energy professionals united by our passions for efficient living, cutting carbon, helping solve the climate crisis, and helping others. Oh, and we love getting outside and playing in the mountain environment we’re working with you to protect.


Mona Newton, Executive Director at CORE

Mona joined CORE as Executive Director in 2012.  As the Executive Director, Mona oversees all operations. She loves working in the Roaring Fork Valley and is passionate about continuing CORE’s work to support communities in achieving their energy efficiency, renewable energy and carbon reduction goals.

With more than 25 years professional experience in the environmental arena, Mona has worked across many sectors. She worked for five years at the Colorado Governor’s Energy Office (GEO) working with communities to develop and implement energy efficiency and renewable energy programs and projects in their communities. Prior to working with the GEO, she worked in the renewable energy sector and as Director of the Center for ReSource Conservation in Boulder.

She has a degree in Political Science from Northwestern Oklahoma State University and Masters degree from the Korbel School of International Studies, University of Denver.  In her free time she spends time traveling, exploring wine tasting and grape growing and outside enjoying nature.


970.925.9775, ext. 500

CORE Program Director Marty Treadway

Marty is the Program Director for CORE. He manages the various CORE grant programs and supervises the remaining energy program offerings. He has been a general contractor in the Roaring Fork Valley since 2001, as the co-owner of a design-build firm specializing in sustainably built custom homes. He received his LEED Green Associate and BPI-Building Analyst certifications in 2011.

Marty’s home is in Carbondale, where he has lived on and off since 1999. He has worked for several architects, volunteered for many years on the the Carbondale Mountain Fair board, Red Hill Council and Roaring Fork Outdoor Volunteers. Some of Marty’s other interests include mountain biking, climbing, skiing, and raising his two wonderful boys Tyler and Potter, with a little help from his wonderful wife, Trina Ortega. Marty holds a Master of Architecture degree from CU Denver, and a Technical Journalism degree from CSU.


970.925.9775, ext. 504


Phi is CORE’s Community Sustainability Manager, working with Roaring Fork Valley communities to meet and expand their climate goals. She became interested in sustainability while traveling in South America, where she became aware of the impacts of climate change and development on tourist destinations. This experience inspired her to obtain a dual master’s degree in business and environmental studies and go on to working in green building and sustainability. Her related experience includes work in LEED and sustainability consulting, sustainable real estate development, energy program development, program evaluation and solar.

Phi has lived in Carbondale since 2014 and loves calling the Roaring Fork home. She can be found skiing, biking, and volunteering or spending time with the many wonderful people in our community.  Phi has a dual master’s degree in business and environmental studies from CU Boulder where she focused on real estate development and sustainable tourism in mountain communities.


970.925.9775, ext. 502


Mike found a love for the outdoors very early while growing up in the Big Apple, finding and appreciating the little nature available in the bustling city. Watching the endless construction projects arise, he knew there must be a cleaner, more sustainable option. He moved to Colorado in the mid-’90s, where his appreciation for our natural resources grew while working for Outward Bound. After taking a Solar design class at SEI, the proverbial light went on. Energy efficiency and clean energy generation just make sense. Mostly a homebody, you may see him out biking, skiing, or catching up with friends at Mountain Fair.


970.925.9775, ext. 506


On her way to California in the late 70’s, Trish Chew landed in Aspen for “one season only.”  The 12” rule was in effect, with the weather pattern of bluebird days, champagne powder, and snow at night.  Realizing the ski bum lifestyle would not be sustainable for the long term, she put her degree in business administration to work for Reese Henry & Co.  Trish started her own accounting business and continued to work closely with the CPA firm. Initially with for profit firms, she shifted her emphasis to the non-profit sector.  Trish enjoyed helping the non-profits achieve their goals and volunteering for their events. With CORE since 2014, she was thrilled to be offered a full-time accountant position.  Working with the best committed staff ever, Trish aims to assist CORE continue to effect positive changes.


970.925.9775, ext. 508

Jesse grew up in Philadelphia and spent his days dreaming of the mountains. After graduating from the University of Denver, receiving a B.S. in Electrical Engineering with a focus in Mechatronic Systems Engineering, he did everything possible to find a job in the valley. His passion for renewable energy and recourse efficiency, as well as his technical background made him a great fit for Aspen CORE, and he is thrilled to be the Program Coordinator for our residential program
Jesse is outgoing, friendly and well versed on the technicalities surrounding renewable energy and recourse efficiency. When he is not skiing, biking, or playing in the mountains, you can find him passionately explaining why renewable energy is the future, and how to make it a reality.  Jesse loves helping those without a technical background understand the benefits of renewables, electrification and recourse efficiency. If you are ever looking for an avid conversation about a more sustainable future, he is the guy to talk to.


970.925.9775, ext. 1005


Andrea grew up outside of Philadelphia. Having environmentalists as parents, she grew up in a world wasting as little as possible. Hot water was turned off if the showers went too long and she collected grass clippings from the neighbors to add to the composting process. Going to college in New England, and living in the mountains and enjoying glacier lakes, started her appreciation of an unpolluted environment; additionally, traveling to counties around the word with serious pollution issues have increased her desire to help do something to preserve our resources. Andrea now helps protect the ever-changing environment around us so we can give those in our future a sustainable world.


970-925-9775 Ext: 514


Mac grew up in Salt Lake City, Utah, where energy, water and the environment were frequently the topic of dinner table conversations. His understanding of energy and the environment were put to the test at an early age in the unforgiving arena of elementary school debate club. From the first time writing a speech on renewable energy, Mac has recognized the importance of environmental issues and formed a belief that education is the first step toward having a meaningful impact.

Volunteering on local political campaigns led to studying Strategic Communications and Political Science, earning B.S. degrees in both from the University of Utah. After graduation, he spent the next eight years working to promote energy literacy among kindergarten through 12th grade students. Mac is thrilled to bring his passion for energy efficiency and community engagement to his role with CORE.

Mac enjoys taking part in all of the incredible outdoor opportunities the Roaring Fork Valley has to offer. Backpacking, hiking, skiing, disc golf and playing soccer are just a few of the ways he might to spend a nice day. On the not so nice days, you will find him listening to new music and working on his latest knitting project.

970.925.9775, ext. 501

Brittany studied Environmental Studies at the University of Vermont where she discovered her passion for sustainability, conservation, and energy efficiency. During college, her love for travel brought her to Costa Rica and Spain where she gained an international perspective on environmental issues. After graduation, she wanted to find bigger mountains and explore the west, so she moved to Aspen to become a snowboard instructor for what she thought would be one winter. The outdoorsy, adventurous lifestyle sucked her in as she continues to enjoy life in the Roaring Fork Valley. Some of her favorite activities include snowboarding, hiking, trail running, camping, and paddleboarding. She has worked for nonprofits since 2016 and strives to have a positive impact on the community through CORE.

970.925.9775, ext. 1008


Bill Sterling Board Chair
Citizen Representative and Co-founder of CORE

Katie Schwoerer Treasurer
Finance Operations Director, ACES

Mona Newton Secretary
Executive Director, CORE

Tom Goode Trustee
City Council Member, Town of Snowmass Village

Alex DeGolia Board Member
Board Member, Holy Cross Energy

Ward Hauenstein Board Member
City Council Member, City of Aspen

Elyse Hottel Board Member
Town Council, Basalt

Cindy Houben Board Member
Director of Community Development, Pitkin County

David Munk Board Member
Vice Chair, Holy Cross Energy

Ashley Perl, Board Member
Climate Action Office Manager, City of Aspen

Greg Poschman, Board Member
County Commissioner, Pitkin County 

Bob Sirkus Board Member
Town Council, Town of Snowmass Village