Leadership
Christopher Callahan, CEO
Christopher Callahan is responsible for driving the strategic direction of one of the nation's most-watched PBS stations as CEO of Arizona PBS. Callahan also is the founding dean of Arizona State University's Walter Cronkite School of Journalism and Mass Communication, leading a 150-member faculty and staff and 2,000 students.
Mary Mazur, General Manager
Mary Mazur is an award-winning television executive who joined Arizona PBS in 2017. In her role as general manager, Mazur leads more than 65 full-time employees, guiding program development, production, community engagement, strategic partnerships, marketing and philanthropy.
Kimberly Flack, Associate General Manager of Educational Outreach
Kimberly Flack has served as associate general manager for educational outreach at Arizona PBS since 2010. Prior to that, she was associate director for educational outreach, after joining the station in 2001 as an instructional specialist coordinator on the professional development team remotely located in Flagstaff, Arizona.
Mark Lodato, Associate General Manager, Innovation and Design
Mark Lodato works to establish new strategies for integration, engagement and collaboration between Arizona PBS and the Cronkite School in his role as associate general manager for innovation and design. Lodato also serves as assistant dean of the Cronkite School, supervising the broadcast and sports curriculum.
Nancy Southgate, Associate General Manager of Content
Nancy Southgate has been the associate general manager of content for Arizona PBS since 2008 after joining the station as program director in February 2006. During her tenure, Arizona PBS has consistently ranked as one of the most-watched public television stations in the country.
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John Misner, Senior Adviser
John Misner is a veteran broadcast executive, who led Phoenix’s highly rated NBC affiliate for more than a decade. He serves as a senior adviser to Arizona PBS and teaches and mentors students at the Cronkite School. He also serves as a senior advisor to the Arizona State University Foundation, assisting with development efforts and with the Central Idea and Sun Devil 365 initiatives.
Mardi Gradolf, Director of Development
Mardi Gradolf is responsible for securing major and planned gifts from individuals, foundations and corporate partners in support of Arizona PBS. Prior to Arizona PBS, Gradolf served as the associate director of development at The Nature Conservancy and the College of Liberal Arts and Sciences at ASU, where she was responsible for major gift fundraising and planned giving.
Ian MacSpadden, Director of Broadcast Engineering and Operations
Ian MacSpadden brings to Arizona PBS more than 25 years working for local, national and international news and broadcast organizations, including ABC News, NBC Universal and Reuters. He joined Arizona PBS in 2015 as director of broadcast operations, overseeing all station technical operations, including planning, installation operation and maintenance of broadcast systems.
Henry Brodersen, Executive Producer of Membership Services
Henry Brodersen has been the executive producer of Membership Services for Arizona PBS since 2005 after joining the station as executive producer of on-air promotions in February 1996. Brodersen has led the station through its annual fundraising campaigns, launched its sustainer program, and helped guide the station through multiple image, on-air and development campaigns.
Amber Back, Events Manager
Amber Back manages signature events for the Cronkite School and Arizona PBS, including the Walter Cronkite Award for Excellence in Journalism Luncheon, PBS KIDS Festival, convocation ceremonies and the weekly speaker series Must See Mondays.
Joe Giordano, Communications Manager
Joe Giordano leads communications for Arizona PBS, where he is charged with overseeing digital and print communications, which includes the Arizona PBS website, Arizona PBS Magazine and social media on Facebook, Twitter and Instagram.
Alex Kosiorek, Manager, Central Sound at Arizona PBS
Alex Kosiorek has been manager of the audio-media production service Central Sound at Arizona PBS since 2012. Kosiorek oversees recording productions, end-to-end management of production facilities, design team coordination and close affiliation with dozens of recognized arts institutions.
Mike Maggio, Membership Manager
Mike Maggio joined Arizona PBS in 2012 as the direct marketing manager responsible for direct mail, canvassing and telemarketing.
