Mr. Trembulak began his career at Geisinger as manager of internal audit in 1976. During his time working at the health system, he served in numerous leadership positions, including executive vice president of the Geisinger Foundation and senior vice president and treasurer of the various Geisinger entities.
Mr. Trembulak has served as a member of the Hospital and Health System Association of Pennsylvania and the Pennsylvania Healthcare Quality Alliance. He is a past chairman of the Pennsylvania Chamber of Business and Industry.
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