Before her new role at Arizona Science Center, Tammy was the Center’s Chief of Staff, a senior leadership position ensuring the effective coordination of cross-functional initiatives and key organizational priorities. With more than two decades of experience in museum and cultural organization operations and fundraising, Tammy led museum guest experience, data analytics, events and development teams at Arizona Science Center, Phoenix Art Museum, Santa Barbara Museum of Natural History and Long Beach Symphony. With her leadership, her teams successfully raised over $150 million for capital initiatives and annual operations.

Throughout all of her experience, Tammy prioritizes focus on building and mentoring strong teams, creating lasting relationships and collaborations throughout an organization, and cultivating strong relationships with stakeholders, donors, members, sponsors and volunteers. 

Stewart earned a Bachelor of Arts in Economics from the University of California, Santa Barbara. She is actively engaged in civic and professional leadership, serving as a member of the Charter 100 Arizona Chapter and on the Board of Directors for the Downtown Phoenix Enhanced Municipal Services District (DTPHX). Stewart also holds a seat on the Giant Screen Cinema Association Leadership Committee which supports content creators to provide immersive, transformational, educational, cinematic experiences internationally. 

In addition, she is a Georgetown University’s New Strategies Program participant, further strengthening her expertise in leadership and organizational development. She resides in Downtown Phoenix, where she remains deeply involved in the community.