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Mark Haas became chief administrative officer for the Cambridge Health Alliance Physicians Organization (CHAPO) in January 2023. Before coming to CHA, Mark was the vice president of operations of the Tufts Medical Center Physicians Organization in Boston beginning at the start of the COVID-19 pandemic, assuming administrative and financial oversight for more than 625 physicians across more than 20 clinical departments and divisions. Additionally, Mark served as the executive director of the Department of Medicine for six years at Tufts.

In previous leadership positions in health information management at both Massachusetts General Hospital in Boston and South Shore Hospital in Weymouth, Mass., Mark assisted with EPIC conversions while overseeing key areas in revenue cycle operations. He received the Massachusetts Health Information Management Association's Professional Achievement Award in 2012.

Mark has served as an assistant adjunct professor at the Tufts University School of Medicine for more than 20 years, teaching courses in healthcare business and informatics. He received the medical school's Lifetime Achievement Award for sustained excellence in teaching in 2013. Mark earned an undergraduate degree in applied physiology and a master's in business administration at Boston University.