Midcontinent Independent System Operator (MISO)
Mariann Fischer is a seasoned professional in data engineering and management, currently serving as the Senior Manager of Data Engineering at Midcontinent Independent System Operator (MISO) since October 2025, where Mariann leads the modernization of the enterprise data platform. Previously, Mariann held roles as Director of Data Management & Engineering and Healthcare Azure Data Architect Modeler at CareAbout Health from August 2023 to October 2025, and as Senior Enterprise Architect at Franciscan Health from January 2023 to August 2023. With significant experience at Franciscan Alliance Information Services as Lead Data Management & Engineering and ETL Informatica Applications Programmer, as well as previous positions at Fifth Third Bank, Universal Music Group, and Bankers Conseco Life Insurance Company, Mariann has developed a strong foundation in data management. Educational credentials include a Bachelor of Science in Informatics from Indiana University Indianapolis and studies at Purdue University.
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