Arapahoe House C-suite Bios

Mike Butler
President and CEO
Mike has more than 30 years of experience in the insurance industry and is a past owner and CEO of Flood and Peterson, one of Colorado’s largest privately held insurance brokers. As CEO, he was responsible for strategic direction and operations. Prior to Flood and Peterson, Mike was a senior vice president at Lockton, the world's largest privately owned, independent insurance brokerage firm. His expertise includes growing and building sustainable companies and workplace culture transformation. He has been a long-time supporter of Arapahoe House, a board member since 2007 and board chair from 2012-2014. He was also the chair of the 6th Annual Arapahoe House Luncheon, the most successful luncheon in the event’s history. Mike has been in recovery for 29 years.
Teri Floyd
Chief Human Resources Executive
Teri Floyd brings more than 26 years of experience in human resources and organizational development to Arapahoe House. She has expertly managed human capital across multiple industries, including manufacturing, finance and sales. Most recently, Teri was the Senior Vice President of Human Resources at Premier Members Credit Union. During her tenure, she created the human resources and training department and was responsible for the human capital during three mergers and acquisitions. Teri brings a wealth of knowledge to her work. She is a certified Senior Professional in Human Resources, a  Franklin Covey program trainer, Development Dimensions International Programs trainer, and a Myers-Briggs Type Indicator facilitator.  Teri’s commitment to the front range community is evident in her volunteerism; she  serves as a board member for the Boulder Area Human Resources Association, , an instructor for Junior Achievement in Boulder and Broomfield school districts, and as an advisory board member for Broomfield City and County. Teri joined Arapahoe House in 2017.

Aleah Horstman Arapahoe House

Aleah Horstman, PhD
Chief Operating Officer

Aleah Horstman has been with Arapahoe House since December 2008. She oversees the organization’s clinical and quality assurance departments and advocates for systematic change that supports individuals suffering from substance use disorders. Aleah has worked in the nonprofit sector for more than 20 years, previously with Planned Parenthood of the Rocky Mountains, Metropolitan State University of Denver, and Greater Cleveland Habitat for Humanity. She earned her Ph.D. from the University of Colorado’s School of Public Affairs and master of science in social administration from Case Western Reserve University. She is a past president of the Association of Fundraising Professionals Colorado Chapter and a Leadership Denver Class of 2011 graduate. Aleah is a current member of Colorado’s Behavioral Health Planning and Advisory Council. 




Kelly MahnckeKelly Mahncke, MBA

Kelly comes to Arapahoe House with significant leadership, healthcare, finance, business development and operations experience. Her most recent healthcare experience includes a key role as CFO and COO at USA Mobility, Colorado’s largest medical mobility equipment provider. At USA Mobility, she led a strategy that increased revenue by more than 200 percent. She is also a past Arapahoe House board member, including chair of the finance committee, and member of the executive committee. Kelly earned a BA in economics from Colorado College, an MBA with an emphasis in finance from University of Colorado at Denver, and holds an executive education certificate from Harvard Business School in value measurement for healthcare. With the implementation of the Affordable Care Act, Kelly’s multifaceted healthcare billing and business development expertise is critical to Arapahoe House’s future.




Dr Mike Stackpool Arapahoe HouseMichael Stackpool, MD
Medical Director

Dr. Michael Stackpool joined Arapahoe House in November 2006. He was born and raised in rural Minnesota and attended the University of Chicago. Dr. Stackpool graduated from the University of Colorado Health Sciences Center and completed his residency in emergency medicine at Denver Health, serving as chief resident in his final year. He previously worked for St. Anthony’s Central Hospital, Exempla Lutheran Hospital and Pridemark Paramedic Services. Dr. Stackpool was elected president and chief financial officer of Emergency Service Physicians in 2005 and held that position for eight years. In 2008, he became medical director of Firestone Fire Protection District EMS. Dr. Stackpool has an ongoing partnership with the Department of Corrections, works closely with state officials on emergency and involuntary commitments and also runs an active Vivitrol practice.