While ALCC remains open from 8:30 AM to 5:00 PM, our availability to answer phone calls and emails will vary as our office is operating remotely. Please do not call the office number 303-757-5611; instead, call a member of our team directly and/or send an email.  Below is the list of ALCC staff phone numbers, emails, and departments. For coronavirus updates, please visit

John McMahonJohn McMahon - Chief Executive Officer

John McMahon most recently served as the executive director of the National Ski Patrol, bringing extensive local and national association management and far-reaching work with other outdoor-related industries to ALCC. His experience with associations, as well as his passion for everything outdoors, made him a perfect fit to lead ALCC.

John’s private sector and non-profit leadership experience includes positions with the Breckenridge Tourism Office, Monterey County Convention and Visitors Bureau, and Vail Resorts and Loveland Ski Area. The governor of California appointed him as a deputy director and chief of marketing for the California State Parks in 2000, which attracted 84 million visitors annually and contributed $2 billion to local communities at the time.

A Colorado resident for over 40 years and raised in Aspen, John now lives in Denver. John loves being outside and is very active in many outdoor activities with his family, friends, and border collie named Zoe. In fact, John often can be spotted paddle boarding with Zoe on Colorado’s lakes and rivers. John also has two grown children, Tess and Paige, who live in New Hampshire and Colorado.

303 757-5611

Melissa EmdinMelissa Emdin - Programs & Education Director

Melissa oversees the Landscape Industry Certification program, ProGreen EXPO speakers, the ELITE Awards, CEO Exchanges, and many more programs. Melissa comes to ALCC after more than a decade of program management and association experience, specializing in certification. She is excited to meet ALCC members and help provide education to meet their needs. Melissa enjoys spending time with her husband Will, sons Owen and Oliver, and dog Parker.

720 307-5092

Tammy DiFalco Tammy DiFalco - Member Relations Manager

As the Member Relations Manager, Tammy’s primary focus is delivering value to members and striving to ensure the best possible member experience. Her favorite part of this role is meeting and getting to know ALCC’s amazing community. She has previous association membership experience and earned her B.S. in Business Administration from Colorado State University. On fall Saturdays Tammy can typically be found in Fort Collins with her husband and son rooting on their Ram football team.  

720 414-2724

Cherie CourtadeCherie Courtade - Communications Director

Cherie's duties include managing Colorado Green, Colorado Green NOW, Tip of the Week, and the monthly member newsletter. She has helped grow ALCC's social media presence and oversees the association's online and email communications. She brings experience managing social media for nonprofits, skills in database management, and an enthusiasm for technology. After living in all four corners of the continental US, Cherie is happily settled in Denver with her husband Mike.

720 465-7074

Rachael Coleman - Office Manager

Rachael handles telephone inquiries for ALCC, marketing and registration for events, fulfillment of bookstore orders, and supports all departments from accounting to membership. Her most recent work experience was in the world of finance, where she supported a team of financial advisors in the New York City area. Her experience in retail management and high-level administrative support make her a customer service pro when it comes to serving member needs. 

720 307-5515