Board of Directors

Board of Directors for the Colorado Mountain Club

Jeff Flax.jpg

Jeff Flax


Mr. Flax is active with the CMC serving as the President of State Board of Directors. He is the former director of the Denver Group’s Wilderness First Aid course, instructor in the Backcountry Ski Touring School, and leads hiking, snowshoeing, cross-country skiing, and biking trips for the club.  He is also past chair of the Denver Group Council.  Jeff is the principal of Jeff Flax and Associates, LLC, a Golden-based litigation technology consulting firm.

Daniel Cummings.jpgDan Cummings

Vice President

Mr. Cummings is a Senior Vice President and Managing Director of the Denver office of EFL Associates, a top 40 retainer-based executive search firm. He is a CPA and holds both an MBA and an undergraduate degree from the University of Kansas. He has served on numerous nonprofit boards in the past. Mr. Cummings is an avid hiker, camper, and cyclist.

Mark Armstrong .jpegMark armstrong


Mr. Armstrong is a Senior Vice President and Commercial Banking Regional Manager responsible for U.S. Bank's Colorado, Utah, and Arizona Portfolio Management teams. He holds an MBA from the University of South Dakota and bachelor’s degrees in Finance and Accounting from Iowa State University. He has served on various non-profit boards in the past focusing on supporting a National Park, outdoor based volunteerism, youth experiences on the Appalachian Trail, people development and risk management within the banking industry. Mr. Armstrong is an avid skier, hiker, mountain biker, and novice fly fisher.

Maren olson


Maren works as a Senior Director for Movement Gyms, leading multiple locations in Colorado. Prior to working in the climbing gym industry, Maren led and managed outdoor leadership programs, and prior to that worked in the field of public health education at a variety of non-profit organizations. She holds a bachelor of science from Lewis & Clark College and an MPH from the Columbia University. Maren has instructed indoor and outdoor climbing, backpacking, and nordic skiing for youth and adults and loves to share a passion for outdoor pursuits with others. She is based in Golden with her family and spends most of her free time outside running, climbing, mountain biking, and gardening.

JACover.jpgJason ANTIN

board member

Jason Antin, a native of New England who now calls Colorado home, focuses all of his time striving to achieve the ultimate work-life balance. Beyond helping launch a handful of outdoor focused start-up companies, he also spends much of his time working as a Technical Climbing Guide for Alpenglow Mountain Guides and Denver Mountain Guiding, and as a strength and conditioning coach at The Alpine Training Center in Boulder, CO where he prepares his athletes for the physical and mental rigors of the mountains. Off the clock, Jason shares his home in Golden, CO with his wife Jenny and 3-year old daughter Avery. He enjoys moving quickly in the mountains over all mediums that mother nature shares with us whether that be trails, rock, ice or snow.

Kristen buckland

board member

Don_1.jpgdon carpenter

board member

Don first joined CMC in 1975 when he took the Basic Mountaineering School and was impressed with the attention to detail and safety in recreating in the mountains. After a long stint in the Chicago area as a research scientist in the food industry he longed to return to Colorado and rejoined CMC 16 years ago. He has held various positions on the Northern Colorado Group Council as Program Director, Group Chair, and  most recently as State Council Representative. In addition to involvement in trail building and maintenance he leads hiking, snowshoe and cross-country ski trips for the club and instructs in the cross-country ski and beginning snowshoe workshops.

christine chopyak

board member

jon frederick

board member

Jon Frederick is a lifelong skier and climber who grew up in the mountains of Washington State. After relocating to Colorado in 2007 with his wife Kelly, Jon found himself managing the marketing department at the renowned specialty retailer Bentgate Mountaineering in Golden, CO. Two kids and countless backcountry hours later he oversaw marketing at Rab/Lowe Alpine before being promoted to the brands’ top U.S. spot in 2019 as Country Manager. Jon now calls Golden, CO home with Kelly, Lena & Owen and spends his summers running & climbing in the Rockies while waiting for temps to drop so he can pursue his favorite activities; winter alpine climbing & backcountry skiing.

peter hamilton

board member

Mr. Hamilton is a Senior Principal in the Denver office of CBIZ CMF LLC, a national financial consulting firm with specific expertise in working with portfolio companies of middle market private equity funds.  He is a CPA and holds a bachelor of science from Miami University and an MBA from the University of Illinois.  Mr. Hamilton thoroughly enjoys being outdoors whether hiking, running, cycling or skiing. He, his wife Kathie, and their children live in the Denver Tech Center. 

robert luecke

board member

Robert is a Colorado native whose great grandparents bought a house on the southwest corner of Alameda and Lincoln in the early 1940s for $23,000 which is still standing today. He is an avid seeker of the history of Colorado and the West and spends considerable work hours and free time understanding life and resource extraction during the Westward Expansion. He holds bachelors degrees in environmental science and civil engineering from Metro State and the University of Colorado and is an engineer-in-training and geologist-in-training. Robert works as a geological engineer for Brierley Associates where he specializes in abandoned mine reclamation, geo-structural design, rock mechanics, soil-structure interaction, and design of grout and concrete.

Robert strives to keep family his first priority. His outdoor activities include rock and ice climbing-with a focus on alpinism and efficient uphill movement, backcountry snowboarding, cycling, trail running, and gardening. He has taken many volunteer roles in the community as a former section chair for the American Alpine Club, an officer of outreach for the American Society of Civil Engineers Colorado Section, audio/video support for a local church. Robert is based out of Arvada.

Jesse mattner

board member

merrillee millar

board member

jason mittman

board member

Jason is passionate about family, friends, the outdoors, commercial real estate, public speaking, and business coaching. He is a competitive athlete and a mountaineer.

He is a licensed Texas Real Estate Broker, CCIM, Society of Exchange Counselors (SEC) Member, and holds a degree in business from U.T.S.A. Jason has over 25 years of Real Estate expertise including analysis, sourcing, development, construction, leasing, finance, acquisition, disposition, and brokerage. Mittman has invested in, owned and developed across the spectrum of real estate including medical office, multi-family, multi-tenant retail, land, hospitality, & single tenant assets.

Jason has worked on complex commercial transactions with a variety of issues including entitlement, environmental, lease, finance, cross-easement, eminent domain, foreclosure, defeasance, development, and re-development. Jason has negotiated difficult leases, development and construction, as well as building purchases and sales with a long list of companies.  Jason has invested in real estate in Texas, Colorado, Utah, Ohio, Michigan, Kentucky, and Tennessee.

Jason focuses considerable effort to various philanthropies focused on the issues of children: poverty, literacy, and physical and mental health; educating, protecting, and increasing access to the outdoors; mentoring young adults on entrepreneurship; and Jewish continuity.  He is passionate about giving thought provoking presentations and leadership workshops on the topic of “Applying lessons from the world’s most brutal races.”

Jason competed for 16 years on the elite adventure racing team: “Team Vignette”. The team has 7 national championships, 53 first place overall finishes, and 88 top 3 overall finishes. He has served on a variety of boards and committees including the US-Israel Science and Technology Foundation, International Technology and Trade Network, The Young Survival Coalition, PESOMEX, Anti-Defamation League, the San Marcos School Bond Committee, Camp Young Judea, and is currently on the board of governors of the Society of Exchange Counselors.

evan randall

board member

Evan Randall has worked as a commercial real estate attorney at Holland & Hart LLP for the last 16 years where he works with clients on leases, property sales and acquisitions, renewables and other infrastructure projects, and other real estate matters.  He has a B.A.A. from the University of Texas at Austin, and a Master in Urban Planning and a law degree from the University of Kansas. 

Evan enjoys hiking, backpacking and running.  This last summer he took his daughter and his niece on their first backpacking trips.  Several years ago, he joined the Colorado Mountain Club and has appreciated and benefitted from the many classes that CMC offers. 

rachel roberts

board member

kathy workman

board member