Our Leadership Team
Theresa McMullanChief Executive Officer
Theresa leads the organization’s diverse activities in raising private funds to benefit Grand Canyon National Park, growing earned income streams through operating retail stores within the park, and providing educational and adventure opportunities through the Grand Canyon Conservancy Field Institute. In addition, she works closely with the NPS staff at Grand Canyon to implement special projects related to major fundraising initiatives and participates in the park’s Inter-tribal Working Group. Theresa joined Grand Canyon Conservancy as a board member in 2014 and transitioned to staff in June 2015. As the previous Chief Operating Officer for GCC, she provided oversight of retail operations, human resources, publishing, IT, and facilities management. She also served as the acting chief financial officer for eight months in 2016. Prior to GCC, Theresa was the Vice President of Marketing & Merchandising for SkyMall (the company that produced the in-flight shopping catalog) in Phoenix, Arizona and the co-founder of a strategic marketing firm. Theresa is an avid hiker and enjoys exploring the Grand Canyon backcountry.
Bonnie BakerChief Philanthropy Officer
Katrina BloemsmaChief Operating Officer
Katrina is energized when working at the intersection of mission and business. She most recently served on the leadership team for REI Experiences, a division of REI Co-op, where she led transformation of their operating model to increase customer and engagement and drive profitable growth. Previously, Katrina has worked testing and scaling new business models, leading dispersed operations teams, and as a high altitude mountain guide at National Parks across North and South America. She first visited the Grand Canyon as a child on an overnight trip to Phantom Ranch. The experience ignited a lifelong passion for connecting people with time outside and helping to protect and steward public lands. Katrina loves to backcountry ski, mountain bike, hike, and surf, and finds great joy in sharing time outside with others.
Darin GeigerDirector of Operations
Minyin HartChief Financial Officer
Laura JonesChief of Staff
Mindy RiesenbergDirector of Marketing and Communications
Mindy has over 25 years of experience as a marketing and communications executive and has lived and worked across the United States. Much 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 Grand Canyon Conservancy in 2017, she worked with the Center for the Future of Arizona, developing content for “The Arizona We Want” vision, 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, a master’s degree from ASU’s Walter Cronkite School of Journalism and Mass Communication, and a certification in Digital Marketing from the American Marketing Association. She is a graduate Fellow of Leading for Change Arizona and has been a featured speaker on the topic of nonprofit marketing for the American Marketing Association, American Association of Museums, the Andy Harvey Indigenous Youth Media Workshop, and many universities across the country. In her free time, Mindy is a professional singer who loves to ski, hike, travel, read, and spend time with her dogs, Annie and Roxie.