Our Staff

Get to Know Us

Grand Canyon Association has staff at Grand Canyon National Park and in Flagstaff, Arizona. We work in a variety of roles in fundraising, marketing, strategic planning, accounting, retail, and administrative positions to ensure your donations are making a difference.


Susan Schroeder
Chief Executive Officer

Susan joined Grand Canyon Association in July 2008. She formerly held various positions at Northern Arizona University in Flagstaff, including the Interim President of the Northern Arizona University Foundation, Associate Vice President for University Advancement, and Director of Development for Environmental and Native American Initiatives. Prior to her 18 years at NAU, Susan was a partner in a market research consulting firm specializing in the tourism and recreation industry, with clients in public land agencies and corporations. Susan is on the Board of the Flagstaff Community Foundation, an affiliate of the Arizona Community Foundation. She enjoys living in Northern Arizona, an incredibly rich natural and cultural environment. "It is a privilege to work with the GCA board, staff, our members, park employees, partners, and the broader community to support this international treasure, Grand Canyon National Park!"


Mike Buchheit
Director, Field Institute

Mike has been with Grand Canyon Association since 1997. In addition to overseeing all aspects of the Field Institute, he has been a mentor/consultant on program development and risk management for a number of sister institutes, a facilitator for National Park Service training events, an active board member for experiential youth groups in the region, and a regular field instructor and public speaker. Mike is also actively involved in Grand Canyon Association's fundraising initiatives in his capacity as a Major Gifts Advisor, is a frequent host to park VIPs, and a subject matter expert for wide-ranging media projects. In his spare time he is a professional landscape photographer and frequent backpacker and river runner throughout his beloved Southwest.


Laura Jones
Director of Strategic Initiatives

Laura moved from Illinois to Grand Canyon in 1995 to enjoy a summer out west. She immediately fell in love with Arizona and decided to make the move a permanent one. After working in the hospitality industry for 14 years, Laura transitioned to Grand Canyon Association hoping for a new challenge working in the rewarding setting of a nonprofit organization. Laura serves as an advocate for the changes that make Grand Canyon Association a stronger partner to the park by leading annual planning processes, strategic initiatives, and special projects critical to GCA’s long-term success. She is an effective facilitator and champion for many critical strategic initiatives involved in growing the organization. "Working for GCA has given me the opportunity to ensure future generations have the opportunity to explore and connect to a place I will forever call home."


Theresa McMullan
Chief Operating Officer

Theresa joined Grand Canyon Association in June 2015. Prior to joining the staff, she was a GCA Board Member and Program Committee Chair. She has over 20 years of management experience leading teams in marketing, merchandising, advertising, and product development. As the former Vice President of Marketing & Merchandising for SkyMall (the company that produces the in-flight shopping catalog) in Phoenix, Arizona, Theresa brings a unique background in both product development and national advertising to GCA. Prior to joining SkyMall, she was the co-founder and president of a strategic marketing firm. She has spoken at several conferences on subjects related to e-commerce and has served on the board of the New Mexico Advertising Federation and as an advisor to the Global Retail Marketing Association. Theresa is an avid hiker and enjoys exploring the Grand Canyon backcountry.


Mindy Riesenberg
Director of Marketing and Communications

Mindy first saw Grand Canyon National Park when she was four years old, while moving from the east coast to the west coast with her family, and it left a remarkable impression on her. She has over 20 years of experience as a marketing and communications executive, and has lived and worked across the United States. Most of her career was spent in marketing leadership positions at major art museums, including the Kimbell Art Museum (Fort Worth, Texas), the Walters Art Museum (Baltimore, Md.) and Phoenix Art Museum. Prior to joining GCA in 2017, she worked with the Center for the Future of Arizona and wrote and reported stories for Cronkite News, covering the topics of borderlands and sustainability. Mindy has a B.A. in journalism from San Diego State University and a master’s degree from ASU’s Walter Cronkite School of Journalism and Mass Communication. She has been a featured speaker on the topic of nonprofit marketing for the American Marketing Association, Texas Association of Museums, and Texas A&M University, among others. In her free time, Mindy is a professional singer who loves to ski, do yoga, and spend time with her dog.


Ann Scheflen
Chief Philanthropy Officer

Ann Scheflen brings to GCA more than 15 years of experience in development and a successful track record leading effective philanthropy programs. She is a Certified Fundraising Executive (CFRE). Ann was Director of Advancement at the National Museum of Wildlife Art in Jackson, Wyoming, and Director of Development at the Museum of New Mexico Foundation in Santa Fe, New Mexico. Ann’s passion for art, culture, history, and the Southwest come together in her post at Grand Canyon National Park. "It’s a critical time for the Park right now. I encourage people to reach out, get in touch and find out how you can help – you may be surprised how much of a difference you can make!"


Andy Vikta
Chief Financial Officer

Andy brings a diverse set of business and personal experiences to Grand Canyon Association. Prior to joining GCA in October 2016, Andy was the CFO of the Adelante Development Center, one of New Mexico's largest nonprofits that serves the developmentally disabled, disadvantaged, and senior populations. This experience was Andy's first in the nonprofit sector after many years of senior financial management and leadership in complex food and aircraft manufacturing, sales, and distribution. Andy's career has supported his love of travel, including living and working with people from around the world in places like Lithuania, Turkey, and France with many other stops in different countries along the way. As CFO at GCA, he now celebrates the chance to support the majestic Grand Canyon, allowing him to return, full-time, to his love of nature and the great outdoors.


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